Complex sentence: In 1958, the newly formed NASA began a recruiting program for astronauts, and Glenn just barely met the requirements as he was close to the age cutoff of 40 and also lacked the required science-based degree at the time.
Split into simpler sentences: In 1958, the newly formed NASA began a recruiting program for astronauts, and Glenn just barely met the requirements. He was close to the age cutoff of 40 and also lacked the required science-based degree at the time.