Complex sentence: The basic variant DF-21 had a range of 1,770 + km, and a payload of consisting of a single 500 kt nuclear warhead, with an estimated circular error probable (CEP) of 300 ~ 400 m; this version did not enter operational service.
Split into simpler sentences: The basic variant DF 21 has a range of 1,770 + km, and a payload of. The missile can carry a single 500 kt nuclear warhead, with an estimated CEP of 300 ~ 400 m. This version did not enter operational service.