Original sentence: Although technically the Ordnance Survey maps have always shown only administrative boundaries, prior to 1974 the difference wasn't as apparent as afterwards.For example, county cricket is still based on the traditional counties.Significantly, the Ordnance Survey and the Post Office both adopted the changes to a degree
Edited sentence: For example, county cricket is still based on the traditional counties — but this may be due to there being no good reason to change, as opposed to rejection of the changes as legitimate.Significantly, the Ordnance Survey and the Post Office both adopted the changes