Complex sentence: Mook attended Hanover High School, where Matt Dunne, a member of the Vermont House of Representatives and theater director at Mook's high school, noticed Mook when he auditioned for a school play.
Split into simpler sentences: Mook attended Hanover High School, where Matt Dunne, a member of the Vermont House of Representatives, served as the theater director. Dunne noticed Mook when he auditioned for a school play.