Complex sentence: Bold Bidder won the 1966 Hawthorne Gold Cup, the Monmouth and Washington Park Handicaps, and set a new race record in winning the 1966 Strub Stakes at Santa Anita Park that stood until 1979 when his son, Spectacular Bid, broke it.
Split into simpler sentences: Bold Bidder won the 1966 Hawthorne Gold Cup, the Monmouth and Washington Park Handicaps, and the 1966 Strub Stakes at Santa Anita Park. In the Strub, he set a track record that stood until 1979 when his son, Spectacular Bid, broke it.