Complex sentence: Retiring in November 2002, Henderson was succeeded as weeknight presenter by Jim Waley, who was at the time host of the "Sunday" program and was one of Nine's most experienced presenters.
Split into simpler sentences: Retiring in November 2002, Henderson was succeeded as weeknight presenter by Jim Waley. Waley was at the time host of the "Sunday" program, and was one of Nine's most experienced presenters.