Complex sentence: The first eclipse mission took place from Pago Pago International Airport in 1965, and flying in conjunction with several other science aircraft, one of the NC-135s managed to fly within eclipse totality for 160 seconds, providing valuable science data.
Split into simpler sentences: The first eclipse mission took place from Pago Pago International Airport in 1965. Flying in conjunction with several other science aircraft, one of the NC-135s managed to fly within eclipse totality for 160 seconds, providing valuable science data.