Complex sentence: "TACAN" is a radio navigation beacon that helps military aircrew identify their location and determine their flight path, in the 1950s and 1960s an indispensible aid to aircrew when traversing over the vast Canadian frontier landscape.
Split into simpler sentences: TACAN is a radio navigation beacon that helps military aircrew identify their location and determine their flight path. In the 1950s and 1960s it was an indispensible aid to aircrew when traversing over the vast Canadian frontier landscape.