Complex sentence: These two types of social thinking begin to affect a child's egocentrism in the concrete stage however carry over to the Formal operational stage when they are then face with abstract thought, and fully logical thinking.
Split into simpler sentences: These two types of social thinking begin to affect a child's egocentrism in the concrete stage. However, it carries over to the formal operational stage when they are then faced with abstract thought and fully logical thinking.