Complex sentence: In the Caribbean theater volunteers from freed French slaves on Marie Galante were used to form the 1st Corps of Colonial Marines, these men bolstered the ranks helping the British to hold the Island until reinforcements arrived.
Split into simpler sentences: In the Caribbean theatre volunteers from freed French slaves on Marie Galante were used to form the 1st Corps of Colonial Marines. These men bolstered the ranks, helping the British to hold the island until reinforcements arrived.