Complex sentence: An updated version of the missile entered service in 1967 designated the KSR-2M, it borrowed some features from the KSR-5 missile (NATO: AS-6 "Kingfisher") including a new Isayev S5.6.0000 rocket motor.
Split into simpler sentences: An updated version of the missile entered service in 1967 designated the KSR-2M. It borrowed some features from the KSR-5 missile (NATO: AS-6 "Kingfisher") including a new Isayev S5.6.0000 rocket motor.