Original sentence: It became the West Lancashire League in 1908, and now covers the whole of modern Lancashire, plus areas of Cumbria, Greater Manchester, Merseyside, and even West Yorkshire
Edited sentence: It became the West Lancashire League in 1908, and now covers the whole of administrative Lancashire, plus areas of Cumbria, Greater Manchester, Merseyside, and even West Yorkshire, all of which still remain within the historic County of Lancashire, despite the different names of their modern administrative counties