Complex sentence: Alternative medicine is any practice that is put forward as having the healing effects of medicine, but does not originate from evidence gathered using the scientific method, is not part of biomedicine, or is contradicted by scientific evidence or established science.
Split into simpler sentences: Alternative medicine is any practice that is put forward as having the healing effects of medicine. It's characteristics are that it does not originate from evidence gathered using the scientific method, is not part of bio-medicine, and is contradicted by scientific evidence or established science.