Complex sentence: Years before, he had put aside his infant daughter to be raised by his client Truelock--because in his younger years Letoy himself had suffered from the curse of irrational jealousy, and had suspected that his daughter was another man's child.
Split into simpler sentences: Years before, he had put aside his infant daughter to be raised by his client Truelock. In his younger years, Letoy himself had suffered from the curse of irrational jealousy, and had suspected that his daughter was another man's child.