Complex sentence: Xiamen Railway is the first railway to enter Fujian's Nanjing County and has stations at "Nanjing" (which, however, is not particularly close to the county seat, Shancheng) and Longshan.
Split into simpler sentences: Xiamen Railway is the first railway to cross Fujian's Nanjing County. The two stations within the county are "Nanjing" (which, however, is not particularly close to the county seat, Shancheng) and Longshan.