Complex sentence: In 1963, the Advanced Propulsion Section of NASA published "Computation of Plug Nozzle Contours by the Rao Optimum Thrust Method" about a study that was performed to design a plug nozzle using Rao's maximum thrust theory using a FORTRAN computer program.
Split into simpler sentences: In 1963, the Advanced Propulsion Section of NASA published "Computation of Plug Nozzle Contours by the Rao Optimum Thrust Method". It was about a study that was performed to design a plug nozzle using Rao's maximum thrust theory using a FORTRAN computer program.