Complex sentence: It was certified platinum in August 1982 by the RIAA, signifying sales of 2 million vinyl copies, and the song has sold 3 million in digital downloads in the United States alone by March 2012.
Split into simpler sentences: It was certified platinum in August 1982 by the RIAA, signifying sales of 2 million vinyl copies. The song had sold over 3 million in digital downloads in the United States alone by March 2012.