Complex sentence: Bin Laden was very ill and was living as prisoner under ISI protection in the garrison town of Abbottabad, the Saudi government also knew about Osama's presence in Abbottabad and had advised the Pakistanis to keep him as a prisoner.
Split into simpler sentences: Bin Laden was very ill and was living as prisoner under ISI protection in the garrison town of Abbottabad. The Saudi government also knew about Osama's presence in Abbottabad and had advised the Pakistanis to keep him as a prisoner.