Complex sentence: The first known example, however, is in a piece by Jan Pieterszoon Sweelinck--it is possible, though not certain, that he used it in homage to one of Johann Sebastian's ancestors, many of whom were themselves musicians.
Split into simpler sentences: The first known example, however, is in a piece by Jan Pieterzoon Sweelinck. It is possible, though not certain, that he used it in hommage to one of Johann Sebastian's ancestors, many of whom were themselves musicians.