Complex sentence: He was offer as Secretary at Run Bung Area, a responsibility he held for three years.In 1969, all the MNF cadres went down to East Pakistan (now Bangladesh), the President, Pu Laldenga engaged him as his Secretary.
Split into simpler sentences: He was offer Secretary at Run Bung Area, a responsibility he held for three years. When in 1969, all the MNF cadres went down to East Pakistan (now Bangladesh), the President, Pu Laldenga engaged him as his Secretary.