Original sentence: Chief Illiniwek was the mascot (often referred to by supporters as the "symbol") of the University of Illinois at Urbana–Champaign (UIUC), associated with the University's intercollegiate athletic programs, from 1926 to February 21, 2007
Edited sentence: Chief Illiniwek was the symbol of the University of Illinois at Urbana–Champaign (UIUC), associated with the University's intercollegiate athletic programs, from 1926 to February 21, 2007