Complex sentence: Typically those who did not do military flight test have an MD or PhD, if not a masters, whereas Tanner's path to becoming an astronaut followed operational military flying and then into NASA for operational jet training before being selected into the astronaut corps.
Split into simpler sentences: Typically those who did not do military flight test have an MD or PhD, if not a masters. Whereas Tanner's path to becoming an astronaut followed operational military flying and then into NASA for operational jet training before being selected into the astronaut corps.