Complex sentence: The regiment, originally numbering slightly more than 1,000 men, departed Worcester on August 23,1861, having been issued inferior smoothbore muskets that had been converted from flintlock to percussion lock.
Split into simpler sentences: The regiment, originally numbering slightly more than 1,000 men, departed Worcester on August 23,1861. They were armed with inferior smoothbore muskets that had been converted from flintlock to percussion lock.