Complex sentence: Helen Keller wrote that happiness comes from "fidelity to a worthy purpose", some people hold that God, as the force that created life, assigns purposes to people and that it is their mission to fulfill them.
Split into simpler sentences: Helen Keller wrote that happiness comes from "fidelity to a worthy purpose". Some people hold that God, as the force that created life, assigns purposes to people and that it is their mission to fulfill them.