Complex sentence: Leonid Stepanovich Dushkin (Леонид Степанович Душкин) (August 15,1910 in the Spirove settlement of the Tver region--April 4,1990), was a major pioneer of Soviet rocket engine technology.
Split into simpler sentences: Leonid Stepanovich Dushkin (Леонид Степанович Душкин), born August 15,1910 in the Spirove settlement of the Tver region. Dushkin was a major pioneer of Soviet rocket engine technology.