Complex sentence: A sketch of the work is stored in the archive of Wels, and an incomplete manuscript and a completed copy with annotations are stored in the archive of the "Österreichische Nationalbibliothek".
Split into simpler sentences: A sketch of the work is stored in the archive of Wels. An incomplete manuscript and a completed copy with annotations are stored in the archive of the "Österreichische Nationalbibliothek".