Complex sentence: Harrold has also produced hypnotherapy CDs for BBC audiobooks and has written four self-help books for Orion Publishing in the United Kingdom and writes for McGraw Hill in the United States.
Split into simpler sentences: Harrold has also produced hypnotherapy CDs for BBC audiobooks and has written four self-help books for Orion Publishing in the United Kingdom. He also writes for McGraw Hill in the United States.