Complex sentence: He learnt the language of cinema from the film society movement which was very popular in Sri Lanka in early sixties, but he also recognized their socio-political limitations in a country which was heading for a period of deep turmoil.
Split into simpler sentences: He learnt the language of cinema from the film society movement which was very popular in Sri Lanka in early sixties. He also recognized their socio-political limitations in a country which was heading for a period of deep turmoil.