 He joined the Khmer Rouge after being part of anti-French colonial and anti-Japanese resistence movements, rising to become the Maoist group's Chief-of-Staff.
<fluency>  He joined the Khmer Rouge after being part of anti-French colonial and anti-Japanese resistence movements, rising to become the Maoist group's Chief-of-Staff.
 He joined the Khmer Rouge after being part of anti-French colonial and anti-Japanese resistance movements, rising to become the Maoist group's Chief-of-Staff.