Complex sentence: Palestinian leader Yasser Arafat was treated at Percy hospital from October 29,2004 to his death on November 11,2004, after being transported there on in an emergency; during his stay at Percy, he fell into an increasingly deeper coma despite intensive care.
Split into simpler sentences: Palestinian leader Yasser Arafat was treated at Percy hospital from October 29,2004 until his death on November 11,2004. During his stay at Percy, he had fallen into an increasingly deeper coma despite intensive care.