Complex sentence: In 1965, the municipal borough was abolished and its former area transferred to Greater London under the London Government Act 1963 to be combined with that of other districts to form the present-day London Borough of Haringey.
Split into simpler sentences: In 1965, the municipal borough was abolished and its former area transferred to Greater London under the London Government Act 1963. Its former area was combined with that of other districts to form the present-day London Borough of Haringey.