Complex sentence: A force of some 2000 French troops led by Gen. Louis Ferrand, resisted a siege of 3 weeks by a force 21,000 troops of the Haitian Army led by General Jean Jacques Dessalines which lasted until the city received naval support from six French frigates.
Split into simpler sentences: A force of some 2000 French troops led by Gen. Louis Ferrand resisted a siege of three weeks by a force of 21000 troops of the Haitian Army led by General Jean Jacques Dessalines. The siege lasted until the city received naval support from six French frigates.