Complex sentence: Farquhar was known as one of the best riders to have never won an Isle of Man TT race, but that changed in 2004, when Ryan won the Production 600 race on a Kawasaki.
Split into simpler sentences: Farquhar was known as one of the best riders to have never won an Isle of Man TT race. That changed in 2004, when he won the Production 600 race on a Kawasaki.