Complex sentence: Gruenwald began his sporting career as a stellar high school wrestler at Greendale High School in Wisconsin, picking up a state championship title and placing second at the 1988 Junior Nationals to rival Dennis Hall.
Split into simpler sentences: Gruenwald began his sporting career as a stellar high school wrestler at Greendale High School in Wisconsin. Gruenwald placed second at the 1988 Junior Nationals to rival Dennis Hall.