Complex sentence: He continued a process begun by his mother and brothers of helping to establish foundations to reform Scottish monasticism to that based on Cluny and he played a part in the organisation of diocese on lines closer to those in the rest of Western Europe.
Split into simpler sentences: He continued a process begun by his mother and brothers, of helping to establish foundations that brought the reformed monasticism based on that at Cluny. He also played a part in the organisation of diocese on lines closer to those in the rest of Western Europe.