Complex sentence: Wiktor (Bruno) was born to a Polish family of Zysmans with Jewish and German roots, but from his mother's side he was a descendant of nobility (Pol. "szlachta").
Split into simpler sentences: Wiktor (Bruno) was born to a Polish Jewish family of Zysmans. From his mother's side he was a descendant of nobility (Pol. "szlachta").