Complex sentence: Indeed, Priestley was close to quitting darts in 2003, unhappy with his form over the previous couple of years and had problems with his eyesight, but in typically determined style he returned to near top form in 2005 following his World Matchplay epic against Taylor.
Split into simpler sentences: Indeed, Priestley was close to quitting darts in 2003, unhappy with his form over the previous couple of years and had problems with his eyesight. He returned to better form in 2005 following his World Matchplay epic against Taylor.