Complex sentence: The deed mentions, without elaboration, the presence of a monastic community at Bonmont in 1123, and makes clear that in 1131, six years after a visit of Bernard of Clairvaux to the area, the monastery had joined the Cistercian Order.
Split into simpler sentences: The deed mentions, without elaboration, the presence of a monastic community at Bonmont in 1123. From the deed, is certain that in 1131, six years after a visit of Bernard of Clairvaux to the area, the monastery had joined the Cistercian Order.