Complex sentence: Like other large, diffuse supergiant stars, UY Scuti is surrounded by an enormous thick orange nebula composed of molecular hydrogen and heavier elements which are essentially opaque to visible light, thereby the star has been studied in the infrared and submilimeter wavelengths.
Split into simpler sentences: Like other large, diffuse supergiant stars, UY Scuti is surrounded by an enormous, thick nebula composed of molecular hydrogen and heavier elements which are essentially opaque to visible light. Therefore the star has been studied in the infrared and submilimeter wavelengths.