Complex sentence: Originally Ashton intended to use the 1864 score of Peter Ludwig Hertel, as it had been used for nearly every revival of the ballet since the late 19th century, but after close inspection of this music Ashton decided it would not suit his plans for the revival.
Split into simpler sentences: Originally Ashton intended to use the 1864 score of Peter Ludwig Hertel, as it had been used for nearly every revival of the ballet since the late 19th century. But after close inspection of this music Ashton decided it would not suit his plans for the revival.