Complex sentence: Rhyne is the grandson of Mike DePalmer Sr., a legendary coach at UT (from 1981-94), a member of the ITA Hall of Fame, and co-founder of the Nick Bollettieri Tennis Academy.
Split into simpler sentences: Rhyne is the grandson of Mike DePalmer Sr., a legendary coach at UT (from 1981-94). His grandfather is a member of the ITA Hall of Fame who co-founded the Nick Bollettieri Tennis Academy.