Complex sentence: For several decades, the engraving was done by the Universitätsdruckerei H. Stürtz (Würzburg), later they were joined by engravers in Leipzig and Darmstadt.
Split into simpler sentences: For several decades, the engraving was done by the Universitätsdruckerei H. Stürtz (Würzburg). Later they were joined by engravers in Leipzig and Darmstadt.