Complex sentence: Bill Saunders (Lancaster), a former prisoner of war living in England, whose experiences have left him unstable and violent, gets into a bar fight in which he in kills a man and then flees.
Split into simpler sentences: Bill Saunders (Lancaster) is a former prisoner of war now living in England, whose experiences have left him unstable and violent. He gets into a bar fight in which he in kills a man and then flees.