Complex sentence: The Arc Trial is a Group 3 flat horse race in the United Kingdom for three-year-old and above thoroughbreds run over a distance of 1 mile 3 furlongs and 5 yards (2,217 metres) at Newbury Racecourse in September.
Split into simpler sentences: The Arc Trial is a Group 3 flat horse race in the United Kingdom for three-year-old and above thoroughbreds. It is run over a distance of 1 mile 3 furlongs and 5 yards (2,217 metres) at Newbury Racecourse in September.