Complex sentence: On 13 January 1975, several men, including Ilich Ramírez Sánchez AKA Carlos the Jackal, made an unsuccessful Rocket-Propelled Grenade attack on an El Al Boeing 707 which was taking off for New York City with 136 passengers.
Split into simpler sentences: On 13 January 1975, several men, including Ilich Ramírez Sánchez AKA Carlos the Jackal, made an unsuccessful Rocket-Propelled Grenade attack on an El Al airliner. The Boeing 707 was taking off for New York City with 136 passengers.