Complex sentence: Varicose veins and reticular veins are often treated before treating telangiectasia, although treatment of these larger veins in advance of sclerotherapy for telangiectasia may not guarantee better results.
Split into simpler sentences: Varicose veins and reticular veins are often treated before treating telangiectasia. Although treatment of these larger veins in advance of sclerotherapy for telangiectasia may not guarantee better results.