Complex sentence: The Long Walk Hurdle is a Grade 1 National Hunt horse race in the United Kingdom for four-year-old and above horses run over a distance of 3 miles 1½ furlongs (5,130 metres) at Ascot Racecourse in December.
Split into simpler sentences: The Long Walk Hurdle is a Grade 1 National Hunt horse race in the United Kingdom for four-year-old and above horses. It is run over a distance of 3 miles 1½ furlongs (5,130 metres) at Ascot Racecourse in December.