Complex sentence: Despite being seated beside Hariri, who was killed when the explosion occurred, Fleihan lived through the attack and was airlifted to Percy where he survived for 64 days before succumbing to his injuries.
Split into simpler sentences: Despite being seated beside Hariri when the explosion occurred, Fleihan lived through the attack. Fleihan was airlifted to Percy where he survived for 64 days before finally succumbing to his injuries.