Complex sentence: The fort had 26 guns ranging from 50-pounder Columbiads to 6-pounder field pieces and over 3,000 pounds of cannon powder, but only nine guns were capable of firing down river (many of the other cannons lacked implements).
Split into simpler sentences: The fort had 26 guns ranging from 50-pounder Columbiads to 6-pounder field pieces and over 3,000 pounds of cannon powder. Only nine guns were capable of firing down river (many of the other cannons lacked implements).