Complex sentence: Major record labels, most notably RCA records and Decca Records, led the establishment of the Nashville sound, which had replaced the fiddles and steel guitars of honky tonk with pop music structures and sounds, including strings, smooth choruses, and a basic rhythm section.
Split into simpler sentences: Major record labels, most notably RCA records and Decca Records, led the establishment of the Nashville sound. The Nashville sound replaced the fiddles and steel guitars of honky tonk with pop music structures and sounds, including strings, smooth choruses, and a basic rhythm section.