Complex sentence: The competition begins: a dog with crutches is outraced by a competitor with a dog as his vehicle, the which animal proceeds then to chase a rabbit through a series of holes, tangling itself and its master up in the process.
Split into simpler sentences: The competition begins: a dog with crutches is outraced by a competitor with a dog as his vehicle. But said dog proceeds to chase a rabbit through a series of holes, tangling itself and its master up in the process.