Complex sentence: Tamara, who wastes no time finding August by giving him a ultimatum, to leave Storybrooke forever and gives him the keys to her vehicle to return to New York City to pick up the potion in her apartment.
Split into simpler sentences: Tamara, who wastes no time finding August and giving him an ultimatum, to leave Storybrooke forever. She gives him the keys to her vehicle to return to New York City to pick up the potion in her apartment.