Complex sentence: The film opens during the closing days of World War I. "John Smith" (Ronald Colman) is a British officer who was gassed and became shellshocked in the trenches and is confined to an asylum because he has lost his memory.
Split into simpler sentences: The film opens during the closing days of World War I. "John Smith" (Ronald Colman) is a British officer who was gassed and became shellshocked in the trenches. He is confined to an asylum because he has lost his memory.