Complex sentence: In 1924, the name of the fibre was officially changed in the U.S. to rayon, although the term "viscose" continued to be used in Europe and currently the material is referred to in the industry as "viscose rayon".
Split into simpler sentences: In 1924, the name of the fiber was officially changed in the U.S. to rayon, although the term "viscose" continued to be used in Europe. The material is commonly referred to in the industry as "viscose rayon".