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 Dec 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 3x World Series Championships (2010,2012,2014); in Dec 2014, he was named 1st-base coach for the Giants. He was promoted to first base coach for the 2015 season.