Complex sentence: During the Second World War a German, Friedrich von Doblhoff, suggested powering a helicopter with ram jets and the first jettip powered helicopter was the WNF 342 V1 in 1943.
Split into simpler sentences: During the Second World War a German, Friedrich von Doblhoff, suggested powering a helicopter with ram jets. The first jettip powered helicopter was the WNF 342 V1 in 1943.