Complex sentence: Morley was author of a book called both "Philosophia Magistri Danielis de Merlac," and "Liber de Naturis inferiorum et superiorum," dedicated to John of Oxford; from the preface is derived all that is known of Morley's life.
Split into simpler sentences: Morley was author of a book called both "Philosophia Magistri Danielis de Merlac," and "Liber de Naturis inferiorum et superiorum," dedicated to John of Oxford. From the preface is derived all that is known of Morley's life.