Original sentence: NATO and Afghan officials also blame Pakistan's Inter-Services Intelligence (ISI) spy network for being involved in terrorist attacks inside Afghanistan.Some of the insurgents and militants in the Afghan resistance groups were of Pakistani origin.They are usually the native Pashtuns from the Waziristan region, the city of Quetta and Khyber Pakhtunkhwa province of Pakistan, and engaged in attacks against US-led NATO forces and the Government of Afghanistan.They have been arrested in the last decade and are held in different prisons across Afghanistan.This allows militants to frequently cross back and forth across the border undetected
Edited sentence: A few of the insurgents and militants in Afghan resistance groups were of Pakistani origin.However, NATO and Afghan officials also blame Pakistan's Inter-Services Intelligence (ISI) spy network for being involved in terrorist attacks.NATO and Afghan officials also blame Pakistan's Inter-Services Intelligence (ISI) spy network for being involved in some of the attacks.They are usually from regions along the Afghanistan-Pakistan border, including the Waziristan region, the city of Quetta and Khyber Pakhtunkhwa province of Pakistan, and engaged in attacks against US-led NATO forces and the Government of Afghanistan.They have been arrested in the last decade and are held in different prisons across the country.This allows militants to frequently cross back and forth across the border unchecked and undetected