Complex sentence: In 2005, the tournament's storyline also revolved around young American golfer Sean O'Hair; he won the event which qualified him to play in the British Open the following week and was a significant part of his PGA Rookie of the Year season.
Split into simpler sentences: In 2005, the tournament's storyline also revolved around young American golfer Sean O'Hair. His win qualified him to play in the British Open the following week and was a significant part of his PGA Rookie of the Year season.