Complex sentence: Patients with difficulty swallowing may benefit from thickened fluids if the person is more comfortable with those liquids, although, so far, there are no scientific study that proves that those thickened liquids are beneficial.
Split into simpler sentences: Patients with difficulty swallowing may benefit from thickened fluids if the person is more comfortable with those liquids. In fact, so far, there are no scientific study that proves that those thickened liquids are beneficial.