Complex sentence: The Army purchased four civil Short 330 aircraft to replace the DHC C-7 Caribou being used to support the Kwajelein Missile Range, these were not given a C-23 designation, they were retired in 1992.
Split into simpler sentences: The Army purchased four civil Short 330 aircraft to replace the DHC C-7 Caribou being used to support the Kwajelein Missile Range. These were not given a C-23 designation, and were retired in 1992.