Complex sentence: After the war, when all civilians were removed from the DMZ (except for two villages near the JSA on opposite sides of the Military Demarcation Line), the empty village of Panmunjom fell in disrepair and eventually disappeared from the landscape.
Split into simpler sentences: After the war, all civilians were removed from the Demilitarized zone (DMZ), except for two villages near the JSA on opposite sides of the Military Demarcation Line. After that, the empty village of Panmunjom fell in disrepair, and eventually disappeared from the landscape.