Complex sentence: The hospital was granted a royal charter in 1935 and finally amalgamated with the Whittington Hospital Obstetric Unit in 1983, to form the present City of London Maternity Unit.
Split into simpler sentences: The hospital was granted a royal charter in 1935. In 1983, the hospital closed and amalgamated with the Whittington Hospital Obstetric Unit to form the present City of London Maternity Unit.