Complex sentence: The Gran Premio di Milano is a Group 1 flat horse race in Italy for three-year-old and above thoroughbred colts and fillies run over a distance of 2,400 metres (approximately 1 mile 4 furlongs) at the San Siro Racecourse, Milan in June.
Split into simpler sentences: The Gran Premio di Milano is a Group 1 flat horse race in Italy for three-year-old and above thoroughbred colts and fillies. It is run over a distance of 2,400 metres (approximately 1 mile 4 furlongs) at the San Siro Racecourse, Milan in June.