Complex sentence: Pakistan Telecommunication Authority (PTA) is government agency responsible for telecommunications in Pakistan PTA has its headquarters at Islamabad and zonal offices located at Karachi, Lahore, Peshawar, Quetta and Rawalpindi.
Split into simpler sentences: Pakistan Telecommunication Authority (PTA) is Pakistanigovernment agency responsible for regulating telecommunications in Pakistan. Headquartered in Islamabad, PTA also has regional offices located in Karachi, Lahore, Peshawar, Quetta and Rawalpindi.