Complex sentence: Following the end of World War II, Mahoney moved to Los Angeles and was a horsebreeder for a short period before moving into movie stuntwork where he doubled for the likes of Gregory Peck, Errol Flynn and John Wayne.
Split into simpler sentences: Following the end of World War II, Mahoney moved to Los Angeles and was a horsebreeder for a short period. He then became a movie stuntman, doubling for top stars such as Gregory Peck, Errol Flynn and John Wayne.