Complex sentence: On August 21,2014, on Mammoth Mountain, he set the world record for the farthest backflip on a bicycle with a 100 foot, 3 inch flip.
Split into simpler sentences: On August 21,2014 he set the world record for the farthest backflip on a bicycle. This took place on Mammoth Mountain, and he did a 100 foot, 3 inch flip.