Complex sentence: The orchestra is currently forced to seat their endpins in planks of wood placed on the stage as the Opera House Trust maintains that the entire building is heritage listed under Australian law and that such work would therefore be illegal.
Split into simpler sentences: The orchestra is currently forced to seat their endpins in planks of wood placed on the stage. The Opera House Trust maintains that the entire building is heritage listed under Australian law and that such work would therefore be illegal.