Complex sentence: Hiley worked with David Bohm over many years on fundamental problems of theoretical physics, resulting in a book published 1993 which is considered a major reference for Bohm's interpretation of quantum theory.
Split into simpler sentences: Hiley worked with David Bohm over many years on fundamental problems of theoretical physics. Together they wrote a book, published 1993, which is now considered the major reference for Bohm's interpretation of quantum theory.