Complex sentence: A slightly modified 50 th Anniversary Edition Corvette was chosen to pace the Indianapolis 500 race in May 2002; then the production vehicle became a centerpiece of the subsequent 50 th Anniversary Celebration, sponsored by Chevrolet.
Split into simpler sentences: A slightly modified 50 th Anniversary Edition Corvette was chosen to pace the Indianapolis 500 race in May 2002. The 50 th Anniversary Edition was a centerpiece of the 50 th Anniversary Celebration, sponsored by Chevrolet.