Complex sentence: He was encouraged in his pursuits by the school's Prefect of Discipline, Brother Matthias Boutlier, a native of Nova Scotia and large man who was greatly respected by the boys both for his strength and for his fairness.
Split into simpler sentences: He was encouraged in his pursuits by the school's Prefect of Discipline, Brother Matthias Boutlier, a native of Nova Scotia. A large man, Brother Matthias was greatly respected by the boys both for his strength and for his fairness.