Complex sentence: He was fired, however, as head writer in late 2002, with his last work airing in December 2002, and two members of his writing staff took on writing duties for a few months until Megan McTavish took over later in 2003.
Split into simpler sentences: He was fired, however, as head writer in late 2002, with his last work airing in December 2002. Two members of his writing staff took on writing duties for a few months until Megan McTavish took over later in 2003.