Complex sentence: Probably because of the shift toward improved cosmetic outcome and "patient satisfaction" provided by Endoscopic Vein Harvesting (EVH) although, EVH has been associated with higher risk of vein graft stenosis and occlusion.
Split into simpler sentences: Probably because of the shift toward improved cosmetic outcome and "patient satisfaction" provided by Endoscopic Vein Harvesting (EVH). Although, EVH has been associated with higher risk of vein graft stenosis and occlusion.