Complex sentence: During the 12th and 13th centuries it flourished and was able to undertake the foundations of its own daughter house, Valdedios Abbey in Asturia; it was also given the supervision of Monfero Abbey after it joined the Cistercian Order.
Split into simpler sentences: During the 12th and 13th centuries it flourished and was able to undertake the foundations of its own daughter house, Valdedios Abbey in Asturia. Sobrado was also given the supervision of Monfero Abbey after it joined the Cistercian Order.