Complex sentence: Around 1881 Salomé was encouraged by her husband to open the first center of superior education for young women in Dominican Republic named "Instituto de Señoritas" and within five years the first six female teachers were graduated from the Institute something uncommon at the time.
Split into simpler sentences: Around 1881 Salomé was encouraged by her husband to open the first center of superior education for young women in the Dominican Republic, which she did under the name of "Instituto de Señoritas". Within five years, the first six female teachers were graduated from the Institute, something uncommon at the time.