Complex sentence: Hayes served as the bullpen catcher for the San Francisco Giants from 2003 to 2014; winning 3x World Series Championships (2010,2012,2014); in December 2014, he was promoted to first base coach for the 2015 season.
Split into simpler sentences: Hayes served as the bullpen catcher for the San Francisco Giants from 2003 to 2014, winning three World Series Championships (2010,2012,2014). In December 2014, he was promoted to first base coach for the 2015 season.