Complex sentence: Bishop Brennan is the reason that Ted, Dougal and Jack are imprisoned in the hellish Craggy Island, as their superiority he had the responsibility of punishing them for un-priest like crimes they have commited.
Split into simpler sentences: Bishop Brennan is the reason that Ted, Dougal and Jack are imprisoned in the hellish Craggy Island. As their superior he had the responsibility of punishing them for un-priest like crimes they have commited.