Complex sentence: A 2012 systematic review suggested that cupping therapy seems to be effective for herpes zoster and various other conditions but due to the high risk of publication bias, larger studies are needed to draw definitive conclusions.
Split into simpler sentences: A 2012 systematic review suggested that cupping therapy seems to be effective for herpes zoster and various other conditions. However, due to the high risk of publication bias, larger studies are needed to draw definitive conclusions.