Complex sentence: It is not a form of treatment sanctioned by practitioners of medicine in America, as it both lacks FDA approval and has no scientific evidence to support its effectiveness for use in intravenous form for any reason whatsoever.
Split into simpler sentences: It is not a form of treatment sanctioned by practitioners of medicine in America, as it lacks FDA approval. Some claim it has no scientific evidence to support its effectiveness for use in intravenous form for any reason whatsoever.