Complex sentence: The two aircraft crashed over San Diego, California, with a total of 144 fatalities: two in the Cessna 172,135 on the PSA Flight 182, and seven on the ground.
Split into simpler sentences: The two aircraft crashed over San Diego, California. There were a total of 144 fatalities: two in the Cessna 172,135 on the PSA Flight 182 and seven on the ground.