Complex sentence: The Gran Criterium is a Group 1 flat horse race in Italy for two-year-old thoroughbred colts and fillies run over a distance of 1,600 metres (approximately 1 mile) at the San Siro Racecourse, Milan in October.
Split into simpler sentences: The Gran Criterium is a Group 1 flat horse race in Italy for two-year-old thoroughbred colts and fillies. It is run over a distance of 1,600 metres (approximately 1 mile) at the San Siro Racecourse, Milan in October.