Complex sentence: DB Schenker Rail (UK) is the largest UK rail freight operator, and a wholly owned subsidiary of the German Deutsche Bahn AG. Headquartered in Doncaster, England, before 2009 the company was known as English, Welsh and Scottish Railway (EWS).
Split into simpler sentences: DB Schenker Rail (UK) is a rail freight company owned by the German Deutsche Bahn AG that is headquartered in Doncaster, England. Before 2009 the company was known as English, Welsh and Scottish Railway (EWS).