Complex sentence: A police vehicle that was being used by a patrolman directing traffic into the show was also struck by debris, with the patrolman, who had just directed the car to make a U-turn to park, barely escaped injury.
Split into simpler sentences: A police vehicle that was being used by a patrolman directing traffic into the show was also struck by debris. The patrolman, who had just directed the car to make a U-turn to park, barely escaped injury.