Complex sentence: Tumansky R-11 (initially AM-11) was developed by A.A.Mikulin, S.K. Tumansky, and B.S. Stechkin as an axial-flow high-altitude non-afterburning turbojet for Yakovlev Yak-25RV reconnaisance aircraft.
Split into simpler sentences: Tumansky R-11 (initially AM-11) is a turbojet engine. The Tumansky R-11 was developed by A.A.Mikulin, S.K. Tumansky, and B.S. Stechkin as an axial-flow high-altitude non-afterburning turbojet for Yakovlev Yak-25RV reconnaisance aircraft.