Complex sentence: Debussy did not publish the piece, and the manuscript remained in the von Meck family; it was eventually sold to B. Schott's Sohne in Mainz, and published by them in 1932.
Split into simpler sentences: Debussy did not publish the piece, and the manuscript remained in the von Meck family. It was eventually sold to B. Schott's Sohne in Mainz, and published by them in 1932.