Complex sentence: Chesshyre also enjoys strong ties with Westminster Abbey, where he was a member of the Architectural Advisory Panel from 1985 until 1998 and the Fabric Commission from 1998 until 2003.
Split into simpler sentences: Chesshyre also enjoys strong ties with Westminster Abbey. He was later a member of the Architectural Advisory Panel, from 1985 until 1998, and then of the Fabric Commission, from 1998 until 2003.