Complex sentence: He is regarded as the first Irish trained horse to win the race having been prepared for the race by John Murphy at The Curragh for County Cork based owner John Courtenay and was ridden on the day by the Irish jockey, Denny Wynne.
Split into simpler sentences: He is regarded as the first Irish-trained horse to win the race having been prepared for the race by John Murphy at The Curragh for County Cork-based owner John Courtenay. He was ridden on the day by the Irish jockey, Denny Wynne.