Complex sentence: In the 2001 Census, the population of Hindus was at almost 40 000, meaning that the number of Hindus tripled in the 10 years since the 1991 census.
Split into simpler sentences: In the 2001 Census, the population of Hindus was almost at 40,000. The number of Hindus effectively tripled in the 10 years since the 1991 census.