Complex sentence: In the 1962--63 season they became the last ever Corinthian League champions, as the league was disbanded and along with most of the other sides, joined the enlarged Athenian League in the new Division One.
Split into simpler sentences: In the 1962--63 season they became the last ever Corinthian League champions, as the league was disbanded. Along with most of the other sides, they joined the enlarged Athenian League in the new Division One.