Complex sentence: The Beholder Mile Stakes, formerly the Vanity Handicap is a Grade I American Thoroughbred horse race for fillies and mares aged three and up over a distance of one mile on the dirt each year in June at Santa Anita Park, Arcadia, California.
Split into simpler sentences: The Beholder Mile Stakes, formerly known as the Vanity Handicap, is a Grade I American Thoroughbred horse race for fillies and mares aged three and up. It is run over a distance of one mile on the dirt each year in June at Santa Anita Park in Arcadia, California.