Complex sentence: The Poule d'Essai des Poulains is a Group 1 flat horse race in France for three-year-old thoroughbred colts run over a distance of 1,600 metres (approximately 1 mile) at Longchamp Racecourse in May.
Split into simpler sentences: The Poule d'Essai des Poulains is a Group 1 flat horse race in France for three-year-old thoroughbred colts. It is run over a distance of 1,600 metres (approximately 1 mile) at Longchamp Racecourse in May.