Complex sentence: It was encouraged by Charlemagne with an increasing number of monasteries being founded across Europe in the late middle ages, the most influential orders during that period being the Benedictines, the Cluniacs founded at Cluny in 910, and then the Cistercians founded in 1098.
Split into simpler sentences: It was encouraged by Charlemagne with an increasing number of monasteries being founded across Europe in the late middle ages. The most influential orders during that period were the Benedictines, the Cluniacs founded at Cluny in 910, and then the Cistercians founded in 1098.