Complex sentence: At the turn of the 21st century, Adidas re-issued a new version of the adidas stan smith--adidas Stan Smith II. The Adidas Stan Smith has sold over 30 million pairs since 1971.
Split into simpler sentences: At the turn of the 21st century, Adidas re-issued a new version of the adidas stan smith-- "adidas Stan Smith II". In total, the adidas stan smith has sold over 30 million pairs since 1971.