Complex sentence: In 1979, it received a major upgrade and became the first airborne radar to incorporate a software programmable signal processor (PSP), and the PSP allowed the system to be modified to accommodate new modes and weapons through software reprogramming rather than by hardware retrofit.
Split into simpler sentences: In 1979, it received a major upgrade and became the first airborne radar to incorporate a software programmable signal processor (PSP). The PSP allowed the system to be modified to accommodate new modes and weapons through software reprogramming rather than by hardware retrofit.