Complex sentence: Griswold was co-chair of the Anglican-Roman Catholic International Commission from 1998 to 2003, and a member of the standing committee for the 1998 Lambeth Conference.
Split into simpler sentences: Griswold was co-chair of the Anglican-Roman Catholic International Commission from 1998 to 2003. He was a member of the standing committee for the 1998 Lambeth Conference.