Complex sentence: The Challow Novices' Hurdle is a Grade 1 National Hunt hurdle race in the United Kingdom for four-year-old and above novices run over a distance of 2 miles 5 furlongs (4,225 metres) at Newbury Racecourse in late December/early January.
Split into simpler sentences: The Challow Novices' Hurdle is a Grade 1 National Hunt hurdle race in the United Kingdom for four-year-old and above novices. It is run over a distance of 2 miles 5 furlongs (4,225 metres) at Newbury Racecourse in late December or early January.