Complex sentence: It then becomes apparent that the entire experience was just a dream, but it has given Sparky a new appreciation of the piano, and he vows to keep practicing until he can play as well as he did in his dream.
Split into simpler sentences: It then becomes apparent that the entire experience was just a dream. But it has given Sparky a new appreciation of the piano, and he vows to keep practising until he can play as well as he did in his dream.