Complex sentence: German submarine "U- 14" was a Type IIB U-boat of the German "Kriegsmarine" during World War II. It served with "3rd U-boat Flotilla" from January 18,1936 to October 31,1939.
Split into simpler sentences: German submarine "U- 14" was a Type IIB U-boat of the German "Kriegsmarine" during World War II. It served with "3. Unterseebootsflottille" from January 18,1936 to October 31,1939.