Complex sentence: It was in the Municipal Borough of Stretford until 1974 when, as a result of the Local Government Act 1972, all of Stretford became part of the Metropolitan Borough of Trafford, in Greater Manchester.
Split into simpler sentences: It was in the Municipal Borough of Stretford until 1974. In 1974, as a result of the Local Government Act 1972, all of Stretford became a part of the Metropolitan Borough of Trafford, in Greater Manchester.