Complex sentence: Kamhaeng Phra Ram was the younger brother of Pha Mueang (ผาเมือง), both being the sons of a Thai leader named Si Nao Nam Thum (ศรีนาวนำถุม).
Split into simpler sentences: Kamhaeng Phra Ram was the younger brother of Pha Mueang (ผาเมือง). The two brothers were the sons of a Thai leader named Si Nao Nam Thum (ศรีนาวนำถุม).