Complex sentence: Following this action, due to political disagreement and bad treatment aboard, some of "Jason" s crew mutinied, locked up the captain and his followers below deck, and sailed into Greenock on 8 June.
Split into simpler sentences: Following this action, political disagreement and bad treatment aboard led some of "Jason" s crew to mutiny. They locked the captain and his followers below deck, and sailed into Greenock on 8 June.