Complex sentence: Rescued from a life raft and returned to England, he was interviewed by BBC radio and proved so popular he became a figurehead for Merchant Navy enlistment propaganda for the rest of the war through newsreels, speaking tours and autobiographical books.
Split into simpler sentences: Rescued from a life raft and returned to England, he was interviewed by BBC radio. He proved so popular he became a figurehead for Merchant Navy enlistment propaganda through newsreels, speaking tours and autobiographical books.