Complex sentence: Hardly anyone succeeded in picturing opera for his audience as impressively as he did, and thus Prawy became an institution of the Viennese opera as the National Guide to Opera ("Opernführer der Nation").
Split into simpler sentences: Hardly anyone succeeded in picturing opera to his audience as impressively as he did. And thus Prawy became an institution of the Viennese opera as the National Guide to Opera ("Opernführer der Nation").