Complex sentence: By 1966, the airport was extremely crowded, and many planes could not fit on the tarmac, so the government of Córdoba planned a new satellite airport to relieve the crowding at San Jeronimo.
Split into simpler sentences: By 1966, the airport was extremely crowded, and many planes could not fit on the tarmac. So the government of Córdoba planned a new satellite airport to relieve the crowding at San Jeronimo.