Complex sentence: Both "Hairspray" and the it's soundtrack were critically acclaimed and the latter of which has since sold over 1,200,000 copies to date in the United States, being certified Platinum by the RIAA.
Split into simpler sentences: Both "Hairspray" and the film's soundtrack were critically acclaimed. The soundtrack has sold over 1,200,000 copies to date in the United States, and has been certified Platinum by the RIAA.