Complex sentence: By the American Civil War, the yard had expanded to employ thousand of skill mechanics with men working around the clock in January 17,1863 the navy yard station logs reflect 3,933 workers on the payroll.
Split into simpler sentences: By the American Civil War, the yard had expanded to employ thousand of skill mechanics with men working around the clock. On January 17,1863 the navy yard station logs reflect 3,933 workers on the payroll.