Complex sentence: The main in the raincoat is revealed to be a pedestrian who had stepped out in front of Christine, causing her to crash the car; he was able to get Jack out safely, but could not reach Christine.
Split into simpler sentences: The main in the raincoat is revealed to be a pedestrian who had stepped out in front of Christine, causing her to crash the car. He was able to get Jack out safely, but could not reach Christine.