Complex sentence: A historical component in the music of Utah, popularity of Mormon folk declined as did traditional music elsewhere with the advent of music recording, but Mormon folk music had already declined before the end of the 19th century.
Split into simpler sentences: A historical component of Utahn music, the popularity of Mormon folk music declined liketraditional music nationally after the advent of music recording. However, uniquely "Mormon" folk music had already declined before the end of the 19th century.