Complex sentence: During his missionary activities, people realized his dedication, selflessness, devotion and in fact moral uprightness and therefore gave their children to be trained to acquire knowledge and moral behavior as they found in him.
Split into simpler sentences: During his missionary activities, people realized his dedication, selflessness, devotion and in fact moral uprightness. They therefore gave their children to him to be trained to acquire knowledge and moral behavior as they found in him.