Complex sentence: The ondes Martenot (or;, "Martenot waves"), also known as the ondium Martenot, Martenot and ondes musicales, is an early electronic musical instrument invented in 1928 by Maurice Martenot.
Split into simpler sentences: The ondes Martenot (or;, "Martenot waves"), also known as the ondium Martenot, Martenot and ondes musicales. It is an early electronic musical instrument invented in 1928 by Maurice Martenot.