Complex sentence: He participated in the Mercury, Gemini, and Apollo projects of the National Aeronautics Space Administration (NASA), overseeing the chemistry, metallurgy, reliability, configuration management, and value engineering of the program.
Split into simpler sentences: He participated in the Mercury, Gemini, and Apollo projects of the National Aeronautics Space Administration (NASA). During this time, he oversaw the chemistry, metallurgy, reliability, configuration management, and value engineering of the program.