Complex sentence: Hoover was Yeager's backup pilot in the Bell X- 1 program and flew chase for Yeager in a Lockheed P-80 Shooting Star during the Mach 1 flight, and flew chase for the 50th anniversary in an F-16 Fighting Falcon.
Split into simpler sentences: Hoover was Yeager's backup pilot in the Bell X- 1 program and flew chase for Yeager in a Lockheed P-80 Shooting Star during the Mach 1 flight. He also flew chase for the 50th anniversary in an F-16 Fighting Falcon.