Complex sentence: The electrified double track line serves as a major conduit for moving coal produced in Shanxi, Shaanxi and Inner Mongolia to Qinhuangdao, China's largest coal-exporting seaport, from there coal is shipped to south China and other countries in Asia.
Split into simpler sentences: The electrified double track line that serves as a major conduit for moving coal produced in Shanxi, Shaanxi and Inner Mongolia to Qinhuangdao, China's largest coal-exporting seaport. From there coal is shipped to south China and other countries in Asia.