Complex sentence: In the first round of the Waste Management Phoenix Open, Mickelson tied his career low round of 60, lipping out a 25-foot birdie putt on his final hole that would have resulted in the sixth 59 in PGA Tour history.
Split into simpler sentences: In the first round of the Waste Management Phoenix Open, Mickelson tied his career low round of 60. However, his 25-foot birdie putt on the final hole lipped out, resulting in him missing out by a single shot on making only the sixth round of 59 in PGA Tour history.