Complex sentence: The 15th Kentucky Infantry was organized at New Haven, Kentucky and mustered in for a three year enlistment on December 14,1861 under the command of Colonel Curran Pope.
Split into simpler sentences: The 15th Kentucky Infantry was organized at New Haven, Kentucky and mustered in for a three year enlistment on December 14,1861. It was mustered in under the command of Colonel Curran Pope.