Simplify the following text for a Grade 11 native English-speaking person.
Original: The City of Nottingham was administratively part of Nottinghamshire between 1974 and 1998 but is now a unitary authority although it remains part of the historic and ceremonial county .
Simplified: The City of Nottingham was administratively part of Nottinghamshire between 1974 and 1998 but is now a unitary authority although it remains part of the county .