Complex sentence: The race was abandoned at Warwick in 2005,2006 and 2007 and transferred on each occasion to Wincanton, where it was run over 2 miles with thirteen fences to jump.
Split into simpler sentences: The race was abandoned at Warwick in 2005,2006 and 2007, and it was transferred on each occasion to Wincanton. At this venue it was run over 2 miles, and there were thirteen fences to jump.