Complex sentence: His opera "Diarmid" was produced at Covent Garden in 1897, and his other music includes cantatas, overtures, part-songs, instrumental pieces, and songs, all markedly Scottish in type.
Split into simpler sentences: His opera "Diarmid" was produced at Covent Garden in 1897. His other music includes cantatas, overtures, part-songs, instrumental pieces, and songs, all markedly Scottish in type.