Complex sentence: He was bred in New Jersey by Isabelle de Tomaso, daughter of Amory Haskell, founder of the Monmouth Park Racetrack and foaled at her Overbrook Farm in Colts Neck.
Split into simpler sentences: He was bred in New Jersey by Isabelle de Tomaso, daughter of Amory Haskell, founder of the Monmouth Park Racetrack. The colt was foaled at her Overbrook Farm in Colts Neck.