Complex sentence: On the morning of October 1,2003, Brim was struck with chest pain and died as he was being taken in an ambulance to a hospital, where it was determined that the cause of death was heart cancer.
Split into simpler sentences: On the morning of October 1,2003, Brim was struck with chest pain. He was rushed to the hospital but died just before the ambulance reached the hospital, where it was discovered that the cause of death was heart cancer.