Complex sentence: These radar sites are linked to the NORAD Hawaii Region Air Operations Center (HIRAOC) at Wheeler Army Airfield, Oahu, where 24-hour air surveillance of the Hawaiian island chain is provided.
Split into simpler sentences: These radar sites are linked to the NORAD Hawaii Region Air Operations Center (HIRAOC) at Wheeler Army Airfield, Oahu,. With these two sites, 24/7 air surveillance of the Hawaiian island chain is provided.