Complex sentence: In 1976, Hay wrote her first book "Heal Your Body", this began as a small pamphlet, containing a list of different bodily ailments and their "probable" metaphysical causes.
Split into simpler sentences: In 1976, Hay wrote a small pamphlet, which came to be called "Heal Your Body". It contained a list of different bodily ailments and their "probable" metaphysical causes.