Complex sentence: He was Vicar of All Saints, Margaret Street, an Anglo-Catholic Church in the West End of London from 1982 to 1985 before becoming the Bishop of Wakefield from 1985 and then the Bishop of London from 1991.
Split into simpler sentences: He was Vicar of All Saints, Margaret Street, the Anglo-Catholic Church in the West End of London, 1982-5. He served as Bishop of Wakefield from 1985 and Bishop of London from 1991.