Complex sentence: Today the National Opera of Belgium, a federal institution takes the name of the theatre in which it is housed, therefore, "de Munt/la Monnaie" refers both to the structure as well as the opera company.
Split into simpler sentences: Today the National Opera of Belgium, a federal institution takes the name of the theatre in which it is housed. Therefore, "de Munt/la Monnaie" refers both to the structure as well as the opera company.