Complex sentence: Lockheed Martin is the primary contractor and is responsible for the majority of the airframe, weapon systems, and final assembly of the F-22, while Boeing provides the wings, aft fuselage, avionics integration, and training systems.
Split into simpler sentences: Lockheed Martin is the prime contractor and is responsible for the majority of the airframe, weapon systems, and final assembly of the F-22. Program partner Boeing provides the wings, aft fuselage, avionics integration, and training systems.