Original: A new building designed by architect Carl Ferdinand Langhans , known as the Königliches Opernhaus ( Royal Opera House ) , was inaugurated the following autumn by a performance of Meyerbeer 's Ein Feldlager in Schlesien .
Simplified: It was called Königliches Opernhaus ( Royal Opera House ) , and it opened with a performance of Meyerbeers Ein Feldlager in Schlesien .