Complex sentence: Nor is there any evidence that one composer was "schooled" by another, in the way that Berg and Webern were taught by Schoenberg, although it is true that Beethoven for a time received lessons from Haydn.
Split into simpler sentences: Nor is there any evidence that one composer was "schooled" by another, in the way that Berg and Webern were taught by Schoenberg. Although it is true that Beethoven for a time received lessons from Haydn.