Complex sentence: Putnam lives on his 20 Acre working ranch in Chino, California that houses his 65 Racehorses that have competed at the Kentucky Derby among other venues including all of racetracks in Southern California.
Split into simpler sentences: Putnam lives on his 20 acre working ranch in Chino, California. It that houses his 65 racehorses, which have competed at the Kentucky Derby and all of racetracks in Southern California.