original: Rawalpindi is also the military headquarters of the Pakistan Armed Forces and also served as the nation's capital while Islamabad was being constructed in the 1960s.
simplifications: Rawalpindi is the base of the Pakistan Armed Forces. It also was a capital while Islamabad was being built. Rawalpindi is headquarters of Pakistan Armed Forces and also the nation's capital while Islamabad was constructed in the 1960s. The military headquarters of the Pakistan Armed Forces is Rawalpindi. Before Islamabad was built in the 60s, it was the capital. Rawalpindi is also the military headquarters of the Pakistan Armed Forces. It was the nation's capital while Islamabad was being built in the 1960s. Rawalpindi is also the military headquarters of the Pakistan Armed Forces. It was also the capital of the country when Islamabad was built in the 1960s. Rawalpindi is the Pakistan Armed Forces' headquarters. It was also Pakistan's capital in the 1960s. Rawalpindi is the military headquarters of the Pakistan Armed Forces. It also served as the nation's capital while Islamabad was being constructed in the 1960s. Rawalpindi is the military headquarters of the Pakistan Armed Forces and was also the Pakistan's capital when Islamad was under construction in the 1960s. The military headquarters for the Pakistan Armed Forces is Rawalpindi, which also was the nation's capital during construction of Islamabad in the 1960's. Rawalpindi was also the military headquarters of the Pakistan Armed Forces and also allowed to serve as the nation's capital while Islamabad was being built in the 1960s.