Simplify the following text for a Grade 6 native English-speaking person.
Original: Formed in 1965 from the Coulsdon and Purley Urban District and the County Borough of Croydon , the borough is now part of the local government association for Greater London , London Councils . The borough has a long history which is based mainly around the economy of the area .
Simplified: The London Borough of Croydon is a London Borough .