Complex sentence: According to the 2011 census, they compose 3.16% of the total population, which alone makes them the largest minority in the country, although various estimations have put the number of Romani people as high as 5--10 percent of the total population.
Split into simpler sentences: According to the 2011 census, they compose 3.16% of the total population, which makes them the largest minority in the country. Various estimations put the number of Romani people between 5 and 10 percent of the total population.