Complex sentence: This plan is successful and the survivors are carried to the Wicked Witch who makes Dorothy her personal slave and orders her to do housework for the castle; scheming to steal Dorothy's magical silver shoes to enhance her own evil powers.
Split into simpler sentences: This plan is successful and the survivors are carried to the Wicked Witch. As her personal slave, the Wicked Witch forces Dorothy to do housework for the castle while scheming to steal her magical silver shoes to enhance her own evil powers.