Complex sentence: In early 1944 research on the usability of dinitrogen tetroxide as an oxidizing agent for rocket fuel was conducted by German scientists, although the Nazis only used it to a very limited extent as an additive for S-Stoff (fuming nitric acid).
Split into simpler sentences: In early 1944 research on the usability of Dinitrogen tetroxide as an oxidizing agent for rocket fuel was conducted by German scientists. Although the Nazis only used it to a very limited extent as an additive for S-Stoff (fuming nitric acid).