Complex sentence: This didn't of course prevent the French conquest of Dahomey (1891-1894) and São João Baptista de Ajudá-now reduced to the territory actually within the walls of the fort-lost what remained of its importance.
Split into simpler sentences: This didn't prevent the French conquest of Dahomey (1891-1894). After this, São João Baptista de Ajudá-now reduced to the territory actually within the walls of the fort-lost what remained of its importance.