Pindar, Pythian 4
This is a long ode, which is also convoluted in terms of its central myth, which is what concerns us. Here is how to read it:

1. Read the Introduction, and continue on to read through the whole ode. Then read the ode over in the following steps, which will help you put its events in chronological sequence.

The basic chronological sequence of events is:

1. return of Jason to Iolcus;
2. reunion with family and dispute with Pelias;
3. proposition of voyage to recover the golden fleece;
4. departure of Argo;
5. landing of Argo in Colchis; 6. episode with Medea;
7. departure of Argo and sojurn on the island of Lemnos;
8. sojourn in Libya, where Euphemus is given the clod of earth;
9. sojourn on Thera, where Medea delivers the prophecy about the foundation of Cyrene;
10. the foundation of Cyrene by Battus, descendant of Euphemus, in the seventeenth generation after the voyage of the Argo.

2. Reread the mythological background paragraph and start the story from that point:

3. Back in Iolcus, Pelias usurped the throne from his elder brother, Aeson. When Jason was born, Aeson had him smuggled out of the way to the centaur Cheiron; when Jason grew up he returned to Iolcus to claim the throne. This part of the myth is related in Pythian 4, beginning with strophe 4 (below), which sets out to explain why the voyage of the Argo was undertaken.

In strophes 4-7, Jason returns to Iolcus. Read these, noting the references to parentage and genealogy: Jason claims the right to the throne (in antistrophe 5) by virtue of his descent from Aeolus. Pelias (the usurper and the half-brother of Jason's father Aeolus), by contrast, was descended from Poseidon rather than Aeolus. (see the Medea Background movie)

4. Pelias is no dummy, however, and in epode 7-strophe 8 he reminds Jason that his grandfather's brother (Athamas) had committed a crime against his son Phrixus which still requires expiation--namely, a voyage to retrieve the golden fleece. If Jason accomplishes that, Pelias promises, he will yield the throne to him.

5. In antistrophe 8-antistrophe 9 Jason assembles the crew of the Argo: note the inclusion of Euphamus, identified as being from Tainaros in the Peloponnese. He is the link to Cyrene, and he is the son of Poseidon and Europa (see epode 2).

6. In epode 9-strophe 10 the Argo sets out, reaches the mouth of the Black Sea (the Euxine), and goes on to land at the banks of the river Phasis in Colchis.

7. The story of Medea and Jason is related in strophe 10-antistophe 11. In epode 11, Pindar indicates he will "make a long story short," and he goes on there and in strophe 12 to relate aspects of the return journey of the Argo and to rejoin the myth to the main body of the poem.

8. The main points of the juncture are:
A. the sojourn with the Lemnian women (epode 11 and strophe 12). There Euphemus engenders a race of descendants. Pindar doesn't say so, but the ancient commentators add the following explanation: Euphemus had intercourse with the Lemnian woman Lamache and Leucophanes was born from the union; Aristotle, the ancestor of Arcesilas, king of Cyrene, was a descendant of this line.
B. the return of Euphemus' descendants to Sparta (strophe 12). At some later point, the family was driven out of Lemnos and went to Sparta.
C. the colonization of Thera (= Kallista) from Sparta (strophe 12).
D. the colonization of Cyrene (=Kyrana) from Thera, which takes us to the next main section of the ode from the chronological point of view:

9. On the voyage home, the Argo and its crew reach the future site of Cyrene. There, the sea-god Triton, in the guise of Eurypylos, son of Poseidon, welcomes the crew, offers them hospitality, and, when they politely decline, gives Euphemus a portent in the form of a clod of earth. This segment is related in epode 1-antistrophe 2.

(Note: in case you were wondering how come the crew was carrying the ship over the desert for twelve days, you can link here to the answer.)

10. In antistrophe 2, Medea, who is speaking, reports that the clod of earth fell overboard as the Argo journeyed home, and that it washed up on the shores of Thera. At this point in the poem, the Argo has landed at Thera, and Medea's speech, delivered on Thera, is part of a prophecy which links Euphemus with Thera.

11. As Medea reports it in antistrophe 1, Libya will eventually be colonized from Thera--i.e., through the foundation of Cyrene.

12. At the end of the prophecy, in epode 2, Medea reports that, if the clod had not been washed overboard, Cyrene would have been colonized from Tainaros, in the fourth generation.

13. Instead, as Medea goes on to explain in strophe 3-epode 3, Cyrene was colonized from Thera by Battus, in the seventeenth generation (see strophe 1; the seventeenth generation from the time of the Argo = eight generations back from the time of Arcesilas, 462 bce).