Complex sentence: According to the 1910 Austro-Hungarian census, 86% of the population of Ptuj's Old Town was German-speaking, while the population of the surrounding villages predominantly spoke Slovenian.
Split into simpler sentences: According to the 1910 Austro-Hungarian census, 86% of the population of Ptuj's Old Town was German-speaking. Already before 1919, the population of the surrounding villages predominantly spoke Slovenian.