Complex sentence: Daniel N. Stern (August 16,1934 in New York City) is a prominent psychiatrist and psychoanalytic theorist, specializing in infant development, on which he has written a number of books-most notably "The Interpersonal World of the Infant" (1985).
Split into simpler sentences: Daniel N. Stern (August 16,1934 in New York City) is a prominent psychiatrist and psychoanalytic theorist, specializing in infant development. He is the author of a number of books on the subject, notably "The Interpersonal World of the Infant" (1985).