Complex sentence: In the mid- 1930s, the National socialist conductor Leopold Reichwein founded a new orchestra, which took the name "N.S. Wiener Tonkünstlerorchester" after Austria was invaded by Germany in 1938.
Split into simpler sentences: In the mid- 1930s a new orchestra was founded by the National socialist conductor Leopold Reichwein. This new orchestra took the name "N.S. Wiener Tonkünstlerorchester" after Austria was invaded by Germany in 1938.