Complex sentence: Curtiss records that in exasperation, the theatre manager Carvalho suggested that Carré burn the libretto, which facetious remark, Curtiss asserts, led Carré to end the opera with the fishermen's tents ablaze as Leila and Nadir make their escape.
Split into simpler sentences: Curtiss records that in exasperation, the theatre manager Carvalho suggested that Carré burn the libretto. This facetious remark, Curtiss asserts, led Carré to end the opera with the fishermen's tents ablaze as Leila and Nadir make their escape.