Complex sentence: James 91 Toussaint joined the revolution after its onset and was immediately regarded as a leader, organizing the Haitian people into a force capable of breaking the French hold on the colony of San Domingo.
Split into simpler sentences: James 91 Toussaint joined the revolution after its onset and was immediately regarded as a leader. He quickly established himself, organizing the Haitian people into a force that was able to break the French hold on the colony of San Domingo.