Complex sentence: His notion of shima-uta was drastically different from that of academics: he applied the term not only to traditional folk songs but to shin min'yō (contemporary folk music) and even to pop music.
Split into simpler sentences: His notion of "shima-uta" was drastically different from that of academics. He applied the term not only to traditional folk songs but to "shin min'yō" (contemporary folk music) and even to pop music.