Complex sentence: It concluded that Mass deworming for soil-transmitted helminths with or without deworming for schistosomiasis had little effect but for schistosomiasis, mass deworming might be effective for weight but is probably ineffective for height, cognition, and attendance.
Split into simpler sentences: It concluded that Mass deworming for soil-transmitted helminths with or without deworming for schistosomiasis had little effect. For schistosomiasis, mass deworming might be effective for weight but is probably ineffective for height, cognition, and attendance.