Complex sentence: After this, Berlioz claimed to have destroyed the entire score, except for the "Resurrexit", but in 1992 a Belgian schoolteacher, Frans Moors, came across a copy of the work in an organ gallery in Antwerp.
Split into simpler sentences: After this, Berlioz claimed to have destroyed the entire score except for one movement (the "Resurrexit"). However, in 1992 a Belgian schoolteacher, Frans Moors, came across a copy of the work in an organ gallery in Antwerp.