Complex sentence: On 22 May 2013, Lockheed and ATK test fired a GMLRS rocket with a new cluster munition warhead developed under the Alternative Warhead Program (AWP), aimed at producing a drop-in replacement for DPICM bomblets in M30 guided rockets.
Split into simpler sentences: On 22 May 2013, Lockheed and Alliant Techsystems test fired a GMLRS rocket with a new cluster munition warhead. The warhead, developed under the Alternative Warhead Program (AWP), is aimed at producing a drop-in replacement for DPICM bomblets in M30 guided rockets.