Complex sentence: The Prix du Gros Chêne is a Group 2 flat horse race in France for three-year-old and above thoroughbreds run over a distance of 1,000 metres (approximately 5 furlongs) at Chantilly Racecourse in late May/early June.
Split into simpler sentences: The Prix du Gros Chêne is a Group 2 flat horse race in France for three-year-old and above thoroughbreds. It is run over a distance of 1,000 metres (approximately 5 furlongs) at Chantilly Racecourse in late May or early June.