Complex sentence: Although both runways are still visible they are no longer in use except for a section of 03/21 used by helicopters and is one of the few Canadian aerodromes to be given in metres rather than feet.
Split into simpler sentences: Although both runways are still visible they are no longer in use except for a section of 03/21 used by helicopters. It is one of the few Canadian aerodromes to be given in metres rather than feet.