Complex sentence: Hereditary peerages continued to be created after 1958 but when Harold Wilson, of the Labour Party, became Prime Minister in 1964 he ceased to recommend the creation of hereditary peerages.
Split into simpler sentences: Hereditary peerages continued to be created after 1958. In 1964, Harold Wilson, of the Labour Party, became Prime Minister; he ceased to recommend the creation of hereditary peerages.