Complex sentence: Usually allopathy refers to biological and chemical treatments based on published scientific research, in contrast to "traditional" healing modalities, which may have scientific verification or support but are based on anecdotal information or religious traditions outside of the modern Western practice of medicine.
Split into simpler sentences: Usually allopathy refers to biological and chemical treatments based on published scientific research. As opposed to "traditional" healing modalities, which may have scientific verification or support, but are based on anecdotal information or religious traditions outside of the modern Western practice of medicine.