Complex sentence: The three piano sonatas numbered 958 through 960 in Deutsch's catalogue of Franz Schubert's complete works, are the composer's last major compositions for the piano, often referred to in short simply as Schubert's last sonatas.
Split into simpler sentences: The three piano sonatas numbered 958 through 960 in Deutsch's catalogue of Franz Schubert's complete works are the composer's last major compositions for the piano. They are often referred to in short simply as Schubert's last sonatas.