Complex sentence: Phone tokens started in Chicago, where public phones that would accept only tokens These were legal in the U.S. until 1944 when they were eliminated and most of the tokens were melted down to make shell casings.
Split into simpler sentences: Phone tokens started in Chicago, where public phones that would accept only tokens these were legal in the U.S. until 1944. Then they were eliminated and most of the tokens were melted down to make shell casings.