Complex sentence: The colt was sired by Forestry out of the mare Oatsee, who was purchased in 2006 by Shackleford's owners for $135,000, and after giving birth to Shackleford, was bred to A.P. Indy and sold, in foal, for $1.55 million.
Split into simpler sentences: The colt was sired by Forestry out of the mare Oatsee, who was purchased in 2006 by Shackleford's owners for $135,000. After giving birth to Shackleford, Oatsee was bred to A.P. Indy and sold, in foal, for $1.55 million.