Complex sentence: She has picked up her boss's Porsche roadster, "Runway" magazine editor Miranda Priestly, from a shop and must get it to Miranda's apartment in time for Miranda's family to go to the Hamptons for the weekend.
Split into simpler sentences: She has picked up a Porsche roadster belonging to her boss, "Runway" magazine editor Miranda Priestly. Sachs must get the roadster to Miranda's apartment in time for Miranda's family to go to the Hamptons for the weekend.