Complex sentence: The Irish 1,000 Guineas is a Group 1 flat horse race in the Republic of Ireland for three-year-old thoroughbred fillies run over a distance of 1 mile at the Curragh in May.
Split into simpler sentences: The Irish 1,000 Guineas is a Group 1 flat horse race in the Republic of Ireland for three-year-old thoroughbred fillies. It is run over a distance of 1 mile at the Curragh in May.