Complex sentence: Swanley Park (which covers 60 acres of countryside) was previously known as New Barn park as it was previously New Barn Farm until various fields and orchards were bought by the Town Council to protect the green belt between Hextable and Swanley.
Split into simpler sentences: Swanley Park (which covers 60 acres) was previously known as New Barn park. It was previously New Barn Farm until various fields and orchards were bought by the Town Council to protect the green belt between Hextable and Swanley.