Original sentence: Bechtel and Williamson , state that "vitalism now has no credibility" because it is often viewed as unfalsifiable, and "therefore a pernicious metaphysical doctrine"
Edited sentence: Bechtel and Williamson , talking of the literal mystical definition of vitalism that "holds that living entities contain some fluid, or a distinctive "spirit", declare their opinion that "vitalism now has no credibility" because it is often viewed as unfalsifiable, and "therefore a pernicious metaphysical doctrine"