Complex sentence: He served from June 27,1981 until December 5,1981, and was General Secretary of Kampuchean People's Revolutionary Party (KPRP, French acronym' PRPK') from 1979 to 5 December 1981.
Split into simpler sentences: He served from June 27,1981 until December 5,1981. And he was Secretary General of Kampuchean People's Revolutionary Party (KPRP, French acronym' PRPK') from 1979 to 5 December 1981.