Original sentence: The region is currently divided amongst three countries: Pakistan controls the northwest portion (Northern Areas and Azad Kashmir), India controls the central and southern portion (Jammu and Kashmir), and the People's Republic of China has occupied the northeastern portion (Aksai Chin)
Edited sentence: The region is currently divided amongst three countries: Pakistan controls the northwest portion (Northern Areas and Azad Kashmir) (India calls these areas "Pakistan-occupied Kashmir" (PoK)), India controls the central and southern portion (Jammu and Kashmir), and the People's Republic of China has occupied the northeastern portion (Aksai Chin)