Complex sentence: The three stations within the county are "Nanjing" (which, however, will not be particularly close to the county seat, Shancheng), Longshan and Hexi; they will serve the county's eastern and northern part.
Split into simpler sentences: The three stations within the county are "Nanjing" (which, however, is not particularly close to the county seat, Shancheng), Longshan and Hexi. They will serve the county's eastern and northern part.