Complex sentence: TAT-2 was AT&T's second transatlantic telephone cable, in operation from 1959 to 1982, initially carrying 48 telephone circuits (simultaneous calls) between France and Newfoundland.
Split into simpler sentences: TAT-2 was AT&T's second transatlantic telephone cable. It was in operation from 1959 to 1982, initially carrying 48 telephone circuits (simultaneous calls) between France and Newfoundland.