Complex sentence: ITV concurrently produced a 44-minute documentary film, "The Great Train Robbery", written and directed by Marion Milne, filmed at actual locations and featuring interviews with Charmian Biggs, Bruce Reynolds and other real-life participants.
Split into simpler sentences: ITV concurrently produced a 44-minute documentary film, "The Great Train Robbery", written and directed by Marion Milne. Filmed at actual locations and featuring interviews with Charmian Biggs, Bruce Reynolds and other real-life participants.