Complex sentence: Cellon was used with the intention of making the aircraft partially transparent and so less visible; however, the Cellon reflected sunlight, making the aircraft more visible, before quickly yellowing due to the effect of ultra violet radiation.
Split into simpler sentences: Cellon was used with the intention of making the aircraft partially transparent and so less visible. Unfortunately, the Cellon reflected sunlight, making the aircraft more visible, before quickly yellowing due to the effect of ultra violet radiation.