Complex sentence: The Arkle Challenge Trophy is a Grade 1 National Hunt chase in the United Kingdom for five-year-old and above novices run over a distance of 2 miles (3,219 metres) on the Old Course at Cheltenham Racecourse during the Cheltenham Festival in March.
Split into simpler sentences: The Arkle Challenge Trophy is a Grade 1 National Hunt chase in the United Kingdom for five-year-old and above novices. It is run over a distance of 2 miles (3,219 metres) on the Old Course at Cheltenham Racecourse during the Cheltenham Festival in March.