Complex sentence: The Sandown Classic Trial is a Group 3 flat horse race in the United Kingdom for three-year-old thoroughbreds run over a distance of 1 mile 2 furlongs and 7 yards (2,018 metres) at Sandown Park Racecourse in late April.
Split into simpler sentences: The Sandown Classic Trial is a Group 3 flat horse race in the United Kingdom for three-year-old thoroughbreds. It is run over a distance of 1 mile 2 furlongs and 7 yards (2,018 metres) at Sandown Park Racecourse in late April.