Complex sentence: Changes included transposing the key of the symphony itself from E flat minor to E minor, to enable orchestras to play the work more easily than had previously been able and allow the work to become a repertory piece for student and amateur orchestras.
Split into simpler sentences: Changes included transposing the key of the symphony itself from E flat minor to E minor. This last change was made to enable orchestras to play the work more easily than had previously been able and could become a repertory piece for student and amateur orchestras.