Complex sentence: After retiring to stud full time, he had a very successful career, becoming the first All American Futurity winner to sire an All American Futurity Winner when his daughter Easy Date won the All American Futurity in 1974.
Split into simpler sentences: After retiring to stud full time, he had a very successful career. He became the first All American Futurity winner to sire another winner when his daughter Easy Date won the All American Futurity in 1974.