Complex sentence: Ever since, Dorothy has had a love-hate relationship with ALF, often threatening to hand him over to the military if he does not behave; in turn Alf calls her the Wicked Witch of the West.
Split into simpler sentences: Ever since, Dorothy has had a love-hate relationship with ALF, often threatening to hand him over to the military if he does not behave. This in turn has ALF calls her the Wicked Witch of the West.