Complex sentence: In 1923, Piaget published a book called, The Language and Thought of the Child, in this book he recorded his observations of children talking to themselves in classrooms and termed the idea of self-talk, as "egocentric speech".
Split into simpler sentences: In 1923, Piaget published "The Language and Thought of the Child". In this book he recorded his observations of children talking to themselves in classrooms and termed the idea of self-talk, as "egocentric speech".