Complex sentence: Hungary's population in the late 16th century was in Ottoman Hungary 900,000, in Habsburg Hungary 1,800,000 and' free' (Transylvania) Hungary 800,000, making a total of 3,500,000 inhabitants for the whole of Hungary.
Split into simpler sentences: Hungary's population in the late 16th century was in Ottoman Hungary 900,000, in Habsburg Hungary 1,800,000 and' free' (Transylvania) Hungary 800,000. Making a total of 3,500,000 inhabitants for the whole of Hungary.