Complex sentence: The Belchford Downhill Challenge is held every year in September, as a competition for gravity powered soapbox carts that race down a half mile course on a steep closed public road at up to 50 mph.
Split into simpler sentences: The Belchford Downhill Challenge is held every year in September. It's a competition for gravity powered soapbox carts that race down a half mile course on a steep closed public road at up to 50 mph.