Complex sentence: Pat studied health and nutrition for over 66 years and lectured on a variety of nutritional subjects and according to the PPNF was the foremost authority on the work of Price and Pottenger.
Split into simpler sentences: Pat studied health and nutrition for over 66 years and lectured on a variety of nutritional subjects. According to the PPNF, she was the foremost authority on the work of Price and Pottenger.