Who is the psychologist who created complex speech?

The psychologist who created complex speech was American psychologist Hall.

The psychologist who created complex speech was American psychologist Hall. Hall believes that personal development is only the repetition of human evolution. This paper puts forward a defense speech, arguing that children of different ages have repeated the life of their ancestors in prehistoric times to various stages of modern human evolution in different forms, and children of different ages have repeated the instinctive characteristics of human ancestors in different forms.