Complex sentence: In 1951, the F-47s were retired to Davis-Monthan AFB and the 131st was re-equipped with the F-51H Mustang Very Long Range fighter and the 131st was re-designated as a Fighter-Interceptor squadron.
Split into simpler sentences: In 1951, the F-47s were retired to Davis-Monthan AFB for retirement and the 131st was re-equipped with the F-51H Mustang Very Long Range fighter. With its air defense mission, the 131st was re-designated as a Fighter-Interceptor squadron.