Complex sentence: He stayed in Bankura until he was 18, when Sarkar moved to Kolkata after completing Higher Secondary from Akui Union high School, He started learning Classical Music from his Guruji Sri Provash Dey and received training in Sound Design from Sri.
Split into simpler sentences: He stayed in Bankura until he was 18, when Sarkar moved to Kolkata after completing Higher Secondary from Akui Union high School. During his stay in Kolkata he started learning Classical Music from his Guruji Sri Provash Dey and received training in Sound Design from Sri.