Complex sentence: Some 100 Redding men volunteered to serve under Captain Zalmon Read in a company of the 5th Connecticut Regiment, which participated in the siege of Quebec's Fort Saint-Jean during the autumn of 1775 before the volunteers' terms of service expired in late November.
Split into simpler sentences: Some 100 Redding men volunteered to serve under Captain Zalmon Read in a company of the 5th Connecticut Regiment, which participated in the siege of Quebec's Fort. St. Jean during the autumn of 1775 before the volunteers' terms of service expired in late November.