Complex sentence: The district was formed on 1 April 1974, under the Local Government Act 1972, by the merger of the Municipal Borough of High Wycombe with Marlow Urban District and Wycombe Rural District.
Split into simpler sentences: The district was formed on 1 April 1974 under the Local Government Act 1972. It was a merger of the borough of High Wycombe, Marlow Urban District and Wycombe Rural District.