Complex sentence: His grandsire was Blushing Groom, a son of Nasrullah from Nearco and his damsire Key To The Mint, a son of Graustark, was the 1972 U.S. Champion 3-Yr-Old Colt.
Split into simpler sentences: His grandsire was Blushing Groom, a son of Nasrullah from Nearco. His damsire Key To The Mint, a son of Graustark, was the 1972 U.S. Champion 3-Yr-Old Colt.