Complex sentence: Sherman was mustered out of volunteer service on April 30,1866, and reverted to his Regular Army rank of colonel and was placed in command of the 3rd Artillery Regiment.
Split into simpler sentences: Sherman was mustered out of the volunteers on April 30,1866. After Sherman was mustered out of volunteer service on April 30,1866, he reverted to his Regular Army grade of colonel and was placed in command of the 3rd Artillery Regiment.