Complex sentence: The Ma'am turns out to be the serial killer and mental patient living in the home escaping from a mental hospital, she tricks the two men in to telling that one of both of them is a killer, but she's the killer.
Split into simpler sentences: The Ma'am turns out to be the serial killer and a mental patient living in the home who escaped from a mental hospital. She tricked the two men into telling that one of them is a killer, though she was in fact the killer.