Complex sentence: He recommended a mixture of whole apple cider vinegar and honey (variously called "switchel" or "honegar") as a health tonic and promoted an alkaline diet; both practices which are still promulgated by various naturopaths.
Split into simpler sentences: He recommended a mixture of whole apple cider vinegar and honey that have variously been called switchel or honegar, as a health tonic. He also promoted an alkaline diet; both practices which are still promulgated by various naturopaths.