Complex sentence: Sales of the coins did not cure the fair's financial woes; fewer than 400,000 were sold at a premium price, and some two million were released into circulation, where they remained as late as the 1950s.
Split into simpler sentences: Sales of the coins did not cure the fair's financial woes; fewer than 400,000 were sold at a premium price. Some two million were released into circulation, where they remained as late as the 1950s.