Original sentence: Although Chester is the administrative centre for Cheshire, Warrington is the largest town within the county.Historically part of Lancashire, and now a Unitary Authority, the population of the Warrington borough, including its 18 civil parishes, is 191,084 (2001 Census).Warrington is a large town and borough in the ceremonial county of Cheshire, England
Edited sentence: Although Chester is the administrative centre for Cheshire, Warrington was the largest town within the county between 1974 -1998.In 1974 the whole town was transferred into Cheshire for administration purposes despite the vast majority of the town being in Lancashire since it's creation in 1100.The population of the Warrington borough, including its 18 civil parishes, is 191,084 (2001 Census).Warrington became a unitary authority in neither county for administration in  1998.Warrington is a large town and borough, now with unitary status, it was a town divided, Lancashire north of the River Mersey and Cheshire south of the Mersey