Complex sentence: In September 2005, based on obtained Arafat records, an Israeli AIDS expert claimed that Arafat bore all the symptoms of AIDS, while "The New York Times" claimed it was highly unlikely that Mr Arafat died from Aids.
Split into simpler sentences: In September 2005, based on obtained Arafat records, Israeli AIDS expert claimed that Arafat bore all the symptoms of AIDS. However, based on the same records "The New York Times" claimed it was highly unlikely that Mr Arafat died from Aids.