Complex sentence: He joined communist party of India (Marxist) at the age of 21 in 1966.his works are mainly focussed on tradeunion works among the plantation labours in idukki.
Split into simpler sentences: He joined Communist Party of India (Marxist) at the age of 21 in 1966. His works are mainly focussed on trade union works among the plantation labourers in Idukki.