Complex sentence: The Aintree Hurdle is a Grade 1 National Hunt hurdle race in the United Kingdom for four-year-old and above horses run over a distance of 2 miles 4 furlongs (4,023 metres) at Aintree Racecourse during the Grand National meeting in early April.
Split into simpler sentences: The Aintree Hurdle is a Grade 1 National Hunt hurdle race in the United Kingdom for four-year-old and above horses. It is run over a distance of 2 miles 4 furlongs (4,023 metres) at Aintree Racecourse during the Grand National meeting in early April.