Complex sentence: On 9 November 1821 the Spanish colony of Santo Domingo was toppled by a group led by José Núñez de Cáceres and they managed to obtain independence for the colony from Spain in December 1821 and Santo Domingo became known as the Republic of Spanish Haiti.
Split into simpler sentences: On 9 November 1821 the Spanish colonial government of Santo Domingo was toppled by a rebel group led by José Núñez de Cáceres. The rebels managed to obtain independence for the colony from Spain in December 1821 and Santo Domingo became known as the Republic of Spanish Haiti.