Complex sentence: British India ceased to exist in 1947, when partition occurred; throughout the Raj period, and onwards until 1961 in the Republic of India, responsibility for census operations lay with temporary administrative structures that were established for each census and then dismantled.
Split into simpler sentences: British India ceased to exist in 1947, when partition occurred. Throughout the British Raj, and onwards until 1961 in the Republic of India, responsibility for census operations lay with temporary administrative structures that were established for each census and then dismantled.