Complex sentence: The first of the three is far more famous than the others, it is one of Schubert's most famous compositions of his entire oeuvre, and it is often simply referred to as "Schubert's" Marche militaire "".
Split into simpler sentences: The first of the three is far more famous than the others. It is one of Schubert's most famous compositions, and it is often simply referred to as "Schubert's" Marche militaire "".