Complex sentence: On the other hand, the abbey flourished now more than ever; due to the success of the Brotherhood, the Crusade and the missions, and to the population explosion in Belgium, the numbers of monks increased to 230 by 1937.
Split into simpler sentences: On the other hand, the abbey flourished now more than ever. Because of the success of the Brotherhood, the Crusade and the missions, and the population explosion in Belgium, the numbers of canons increased to 230 by 1937.