Complex sentence: Jordan received his high-school education in Tarnopol and in Tarnów, however, in 1861 he took part in pro-Polish demonstrations for which he was threatened with expulsion from school.
Split into simpler sentences: Jordan received his high-school education in Tarnopol and Tarnów. In 1861, however, he took part in pro-Polish demonstrations for which he was threatened with expulsion from school.