Complex sentence: John Elliott Burch (born circa 1923) is a retired American National Museum of Racing and Hall of Fame Thoroughbred racehorse trainer whose horses include four that would be inducted in the U.S. Racing Hall of Fame.
Split into simpler sentences: John Elliott Burch (born circa 1923) is a retired American National Museum of Racing and Hall of Fame Thoroughbred racehorse trainer. Four of his horses were inducted in the National Museum of Racing and Hall of Fame.