Complex sentence: Apted was intrigued by the actual events behind the film, which gave the Pine Ridge Indian Reservation the highest per capita murder rates at the time and also made a documentary, Incident at Oglala.
Split into simpler sentences: Apted was intrigued by the actual events behind the film, which gave the Pine Ridge Indian Reservation the highest per capita murder rate at the time. Apted also made a documentary, Incident at Oglala.