Complex sentence: He was promoted to the rank of major in June 1864 and for "meritorious conduct" at Fort Fisher, he was recommended for promotion by President Lincoln, and brevetted lieutenant colonel on March 13,1865.
Split into simpler sentences: He was promoted to the rank of major in June 1864. For "meritorious conduct" at Fort Fisher, he was recommended for promotion by President Lincoln, and brevetted lieutenant colonel on March 13,1865.