Complex sentence: This was contradicted by the stipulation of facts document signed by Khadr as part of his plea-agreement on October 26,2010, which said that Khadr had "extensive firsthand knowledge" of his father's supportive role in Al Qaeda operations.
Split into simpler sentences: This was contradicted by the stipulation of facts document which Khadr signed as part of his plea-agreement on October 26,2010. It held that Khadr had "extensive firsthand knowledge" of his father's supportive role in al-Qaeda operations.