Complex sentence: Dr. Anton Phibes is an expert in theology and music who is thought to have been killed in a car crash in 1921; his beloved wife, Victoria, died during an operation just previous to the car crash.
Split into simpler sentences: Dr. Anton Phibes is an expert in theology and music who was thought to have been killed in a car crash in 1921. His beloved wife, Victoria, died during an operation not long before the car crash.