Original sentence: He was assigned to Fort Atkinson in 1851, and on December 31, 1851, he was promoted to first lieutenant.On March 26, 1855 Buckner resigned from the army to work with his father-in-law, who owned extensive real estate business ventures in Chicago, Illinois.On November 3, 1852, he was elevated to captain of the commissary department
Edited sentence: On December 31, 1851, he was promoted to first lieutenant, and on November 3, 1852, he was elevated to captain of the commissary department.On March 26, 1855 Buckner resigned from the army to work with his father-in-law, who had extensive real estate holdings in Chicago, Illinois.Shortly after marriage, he was assigned to Fort Snelling and later to Fort Atkinson on the Arkansas River in present-day Kansas