Complex sentence: She discharged her cargo of fuel oil into U.S. Navy tanks at Devonport, England, returned to the United States, and left Norfolk on her second eastbound voyage on 26 January 1918, arriving in Plymouth, England, through severe winter storms on 12 February 1918.
Split into simpler sentences: She discharged her cargo of fuel oil into U.S. Navy tanks at Devonport, England, and returned to the United States. She left Norfolk on her second eastbound voyage on 26 January 1918, arriving in Plymouth, England, through severe winter storms on 12 February 1918.