Complex sentence: Conditioned for racing by John Shirreffs, Life Is Sweet won some of Califonia's major stakes races in 2009 and notably earned a second to Zenyatta in the Grade I Vanity Handicap, and a third in the Hollywood Gold Cup.
Split into simpler sentences: Conditioned for racing by John Shirreffs, Life is Sweet won some of Califonia major stakes races and ran second to her rival Zenyatta. She notable ran sencond to Zenyatta in the Grade I Vanity Handicap, and Third in the Hollywood Gold Cup.