Complex sentence: Dubious models and practices burgeoned, in parallel with bona fide, and for a number of these new practices, profit marketability or New Age appeal proved a stronger motive than realism or ethics.
Split into simpler sentences: Dubious models and practices burgeoned, in parallel with bona fide. For a number of these new practices, profit, marketability or New Age appeal proved a stronger motive than realism or ethics.