Complex sentence: As development dragged on, the system was eventually abandoned in December 1963 in favor of the simpler SCANFAR system, which used a phased-array radar for search, but retained the individual illumination radars for missile guidance.
Split into simpler sentences: As development dragged on, the system was eventually abandoned in December 1963 in favor of the simpler SCANFAR system. SCANFAR used a phased-array radar for search, but retained the individual illumination radars for missile guidance.