Complex sentence: Koussa describes Abu Nidal as a ruthless murderer and terrorist that Gaddafi allowed to live in Libya in 1986, the year the United States launched Operation El Dorado Canyon against Gaddafi for his association and harboring of Abu Nidal.
Split into simpler sentences: Koussa describes Abu Nidal as a ruthless murderer and terrorist that Gaddafi allowed to live in Libya in 1986. It was in 1986 that The United States launched Operation El Dorado Canyon against Gaddafi for his association and harboring of Abu Nidal.