Complex sentence: With the new sound, the public had gained a newfound interest in the Bee Gees and their music, and the single sold over a million copies in the United States alone, and selling in excess of a hundred thousand copies in Canada.
Split into simpler sentences: With the new sound, the public had gained a newfound interest in the Bee Gees and their music. The single sold over a million copies in the United States alone, and sold in excess of a hundred thousand copies in Canada.