Complex sentence: Among his major contributions to psychology are the "triarchic theory of intelligence", several influential theories related to creativity, wisdom, thinking styles, love and hate, and is the author of over 1500 articles, book chapters, and books.
Split into simpler sentences: Among his major contributions to psychology are the triarchic theory of intelligence and several influential theories related to creativity, wisdom, thinking styles, love, and hate. He is the author of over 1500 articles, book chapters, and books.