Complex sentence: In 1962, he was honoured with a National Academy of Science resident associateship tenable with NASA at Ames Research Centre and in 1963 he had the opportunity to join NASA's Exobiology Division and take over the helm of the Chemical Evolution Division.
Split into simpler sentences: In 1962, he was honoured with a National Academy of Science resident associateship tenable with NASA at Ames Research Center. In 1963 he had the opportunity to join NASA's Exobiology Division and take over the helm of the Chemical Evolution Division.