Complex sentence: Fellow actress Thuy Trang was killed in the crash due to the internal injuries she had sustained, and, owing to catastrophic injuries, Rockwood was paralyzed and rendered a C4-5 quadriplegic.
Split into simpler sentences: Fellow actress Thuy Trang was killed in the crash due to the internal injuries she had sustained. And owing to catastrophic injuries, Rockwood was paralyzed and rendered a C4-5 quadriplegic.