Complex sentence: Matters continued post- 1953 as they had in 1950; there would be no perceptible moves toward a unified forward air control doctrine for the U.S. military between 1946 and 1966.
Split into simpler sentences: Matters continued post- 1953 as they had in 1950. There would be no perceptible changes toward a unified forward air control doctrine between 1946 and 1966.