last three
...that the last three piano sonatas by Franz Schubert , published eleven years after the Austrian composer's death, are often regarded as a trilogy?
...that the <b id="mwBxk"><a href="./Schubert's_last_sonatas" id="mwBxo" rel="mw:WikiLink" title="Schubert's last sonatas">last three</a></b> <a href="./Piano_sonata" id="mwBxs" rel="mw:WikiLink" title="Piano sonata">piano sonatas</a> by <a href="./Franz_Schubert" id="mwBxw" rel="mw:WikiLink" title="Franz Schubert">Franz Schubert</a> <i id="mwBx0">(pictured)</i>, published eleven years after the <a href="./Austrians" id="mwBx4" rel="mw:WikiLink" title="Austrians">Austrian</a> <a href="./Composer" id="mwBx8" rel="mw:WikiLink" title="Composer">composer</a>'s death, are often regarded as a <a href="./Trilogy" id="mwByA" rel="mw:WikiLink" title="Trilogy">trilogy</a>?