Complex sentence: Due to the expropriation of IG Farben's patents and recipes, VA 10820 came to the United States, where it was given the international nonproprietary name "methadone" in 1949.
Split into simpler sentences: Due to the expropriation of IG Farben's patents and recipes VA 10820 came to the United States. There it was given the international nonproprietary name "methadone" in 1949.