Complex sentence: Rousseau was only able to retain some of the thoughts, the "crowd of truths", that flowed from that idea-these eventually found there way into his "Discourses" and his novel "Emile".
Split into simpler sentences: Rousseau was only able to retain some of the thoughts, the "crowd of truths", that flowed from that idea. These eventually found there way into his "Discourses" and his novel "Emile".