Original sentence: The University of Illinois at Urbana–Champaign (also known as U of I, Illinois, or colloquially as the University of Illinois or UIUC) is a public research university in Illinois and the flagship institution of the University of Illinois System
Edited sentence: The University of Illinois at Urbana–Champaign (also known as U of I, Illinois, or colloquially as the University of Illinois or UIUC) is a public research university in Illinois and the crown jewel institution of the University of Illinois System