Complex sentence: In 2005, obtained medical records showed that his doctors could not agree on the cause of the 75-year-old's death, stating that Arafat died from a stroke that stemmed from an unknown condition.
Split into simpler sentences: In 2005, obtained Arafat records, showed that his doctors could not agree on the cause of the 75-year-old's death. Stating that Arafat died from a stroke that stemmed from an unknown condition.