Complex sentence: They learn to counter the memory spell with forget-me-nots, and draw the inhabitants out too--including the lost King and Queen of Oogaboo; but they also seek to end the spell on the town.
Split into simpler sentences: They learn to counter the memory spell with forget-me-nots, and draw the inhabitants out too--including the lost King and Queen of Oogaboo. They also seek to end the spell on the town.