Complex sentence: It was certified platinum for sales of over a million copies in the U.S. The first single, "I.G.Y.", hit the "Billboard" Adult Contemporary Top 10 and peaked at number 26 on the Hot 100.
Split into simpler sentences: It was certified platinum for sales of over a million copies in the US. The song hit the Adult Contemporary Top 10 and peaked at number 26 on the "Billboard" Hot 100.