Complex sentence: Tradition ascribes authorship of the book to Isaiah son of Amoz, but for over a hundred years scholars have seen it as a compilation of writings from three different periods.
Split into simpler sentences: Tradition ascribes authorship of the book to Isaiah son of Amoz. Yet his is the only name attached to it Scholars that do not adhere to the single authorship view have seen it as a compilation of writings from three different periods.