Complex sentence: The 28th Kentucky Infantry was organized at Louisville and New Haven, Kentucky and mustered in for a three year enlistment on May 9,1862 under the command of Colonel William P. Boone.
Split into simpler sentences: The 28th Kentucky Infantry was organized at Louisville and New Haven, Kentucky and mustered in for a three year enlistment on May 9,1862. It was mustered in under the command of Colonel William P. Boone.