Complex sentence: Welby became Sub-Dean and Canon for Reconciliation Ministry at Coventry Cathedral in 2005; moved to become Dean of Liverpool as of December 2007 and Bishop of Durham as of November 2011.
Split into simpler sentences: Welby became Sub-Dean and Canon for Reconciliation Ministry at Coventry Cathedral in 2005. He has since moved to become Dean of Liverpool as of December 2007 and Bishop of Durham as of November 2011.