Complex sentence: In Fall 2006, WGGB rehired Ed Carroll to be Chief Meteorologist who had previously been at the station from 1989 until 1993 before moving to WBZ-TV in Boston.
Split into simpler sentences: In Fall 2006, WGGB rehired Ed Carroll to be Chief Meteorologist. He had previously been at the station from 1989 until 1993 before moving to WBZ-TV in Boston.