Complex sentence: Offit declined to do a book tour for "Autism's False Prophets", citing concerns about his physical safety and comparing the intensity of hatred and threats directed at him to that experienced by abortion providers.
Split into simpler sentences: Offit declined to do a book tour for "Autism's False Prophets", citing concerns about his physical safety. Offit compared the intensity of hatred and threats directed at him to that experienced by abortion providers.