Complex sentence: Jamie himself manages to survive when he accidentally falls into one of the last lifeboats before the "Titanic" sinks and atones for his past life after he finds Aase in the makeshift hospital aboard the "Carpathia".
Split into simpler sentences: Jamie himself manages to survive when he accidentally falls into one of the last lifeboats before the "Titanic" sinks. He subsequently atones for his past life after he finds Aase in the makeshift hospital aboard the "Carpathia".