Complex sentence: In 1989 she became a fellow of Newnham College, Cambridge, where she had completed her PhD, and in 1998 she returned to Warwick as Professor of English and Comparative Studies.
Split into simpler sentences: In 1989 she became a fellow of Newnham College, Cambridge, where she had completed her PhD. In 1998 Greer returned to Warwick as Professor of English and Comparative Studies.