Complex sentence: In 1147 Savigny Abbey, with all its affiliated monasteries, was united to the Cistercian Order, and from that time onwards La Trappe was a Cistercian abbey, immediately subordinate to the abbot of Clairvaux.
Split into simpler sentences: In 1147 Savigny Abbey, with all its affiliated monasteries, was united to the Cistercian Order. From that time onwards, La Trappe was a Cistercian abbey, immediately subordinate to the abbot of Clairvaux.