Complex sentence: Underneath sat a box-section aluminum impact bar on two Omark-bolt slider brackets similar to the system used in the nose which allowed the Corvette to pass federal five-mph impact tests at the rear as well as the front.
Split into simpler sentences: Underneath sat a box-section aluminum impact bar on two Omark-bolt slider brackets similar to the system used in the nose. This design allowed the Corvette to pass federal five-mph impact tests at the rear as well as the front.