Complex sentence: In 1983, Ranariddh joined FUNCINPEC, a Cambodian royalist political party, and in 1986 he became the chief-of-staff and commander-in-chief of the Armee Nationale Sihanoukiste.
Split into simpler sentences: In 1983, Ranariddh joined FUNCINPEC, a Cambodian royalist political party. Three years later in 1986, he became the chief-of-staff and commander-in-chief of the Armee Nationale Sihanoukiste.