Complex sentence: The NTSB suggested two changes to the DC-10 to ensure that the Windsor accident would not recur: changes to the locking mechanism to ensure it could not be forced closed, as well as venting cut into the rear cabin floor.
Split into simpler sentences: The NTSB suggested several changes to the system to ensure that the Windsor accident would not recur. These included changes to the locking mechanism to ensure it could not be forced closed, as well as venting cut into the rear cabin floor.