sentences:  On 16 August 1958 the minor district ("king amphoe") was split off from Kantharawichai District, consisting of the four "tambons" Chiang Yuen, Chuen Chom, Ku Thong, and Nong Son.On 11 December 1959 it was upgraded to a full district.The district is divided into eight sub-districts ("tambons"), which are further subdivided into 116 villages ("mubans").