Complex sentence: Borell also competed in Triathlon, originally as a way to keep fit for Motorsport, however he soon excelled winning the 2009/10 Queensland Triathlon Series and competing for Australia at the 2010 Triathlon World Championships.
Split into simpler sentences: Borell also competed in triathlon, originally as a way to keep fit for motorsport. He won the 2009/10 Queensland Triathlon Series and competed for Australia at the 2010 Triathlon World Championships.