Complex sentence: After five days of intense interrogation, Abu Jandal identified many of the hijackers and became among the first sources to link the 9/11 attacks to al-Qaeda, and provided information for the United States war on Afghanistan in October 2001.
Split into simpler sentences: After five days of intense interrogation, Abu Jandal identified many of the hijackers and became a significant source to link the 9/11 attacks to al-Qaeda. He then provided information for the United States war on Afghanistan in October 2001.