Complex sentence: In 1940 the family and the cymbal making operation moved to Poland, where they continued under extremely difficult conditions, and in 1945 to Germany, and then in 1957 a new headquarters and production facility was established in Switzerland.
Split into simpler sentences: In 1940 the family and the cymbal making operation moved to Poland, where they continued under extremely difficult conditions, and in 1945 to Germany. Finally in 1957 a new headquarters and production facility was established in Switzerland.