Complex sentence: The Gold Cup at Santa Anita Stakes is an American Grade I stakes race for thoroughbred horses inaugurated in 1938 at Hollywood Park Racetrack in Inglewood, California as the Hollywood Gold Cup.
Split into simpler sentences: The Gold Cup at Santa Anita Stakes is an American Grade I stakes race for thoroughbred horses. The race inaugurated in 1938 at Hollywood Park Racetrack in Inglewood, California as the Hollywood Gold Cup.