Complex sentence: Hall was driven to a location in the San Gabriel Mountains beyond where they had taken Cindy Schaeffer, where she was raped twice by Bittaker and once by Norris.
Split into simpler sentences: Hall was driven to a location in the San Gabriel Mountains beyond where Bittaker and Norris had taken Cindy Schaeffer. At this location, Hall was raped twice by Bittaker and once by Norris.