Complex sentence: St Mihangel's was largely rebuilt in 1862 by Henry Kennedy, architect of the Diocese of Bangor; some of the earlier building, especially the east end, was reused in Kennedy's church.
Split into simpler sentences: St Mihangel's was largely rebuilt in 1862 by Henry Kennedy, architect of the Diocese of Bangor. Some of the earlier building, especially the east end, was reused in Kennedy's church.