Complex sentence: Unschooling encourages exploration of activities initiated by the children themselves, believing that the more personal learning is, the more meaningful, well-understood and therefore useful it is to the child.
Split into simpler sentences: Unschooling encourages exploration of activities initiated by the children themselves. Unschoolers base their methods on the theory that the more personal learning is, the more meaningful, well-understood and therefore useful it is to the child.