Complex sentence: Though enrolled in the Delian League it remained disaffected towards Athens, and in 477 had to be coerced by the establishment of a cleruchy on the island; nevertheless, in 411 Andros proclaimed its freedom, and in 408 withstood an Athenian attack.
Split into simpler sentences: Though enrolled in the Delian League it remained disaffected towards Athens, and in 477 had to be coerced by the settlement of a cleruchy. In 411 Andros proclaimed its freedom and in 408 withstood an Athenian attack.