Complex sentence: Gardner was from Georgia and when the war broke out he resigned from the U.S. Army, and he was appointed as a major of infantry in the regular army of the Confederate States on March 16,1861.
Split into simpler sentences: Gardner was from Georgia and when the war broke out he resigned from the U.S. Army. He was appointed as a major of infantry in the regular army of the Confederate States on March 16,1861.