Complex sentence: He proved to be a good soldier, rising to the rank of first sergeant within a year and took part in numerous battles, including the Battle of Vicksburg, where he was seriously wounded, and Sherman's March to the Sea.
Split into simpler sentences: He proved to be a good soldier, rising to the rank of first sergeant within a year. He took part in numerous battles, including the Battle of Vicksburg, where he was seriously wounded, and Sherman's March to the Sea.