Complex sentence: Emil Grunzweig was born in the town of Cluj-Napoca in Transylvania, Romania, as the son of a mother (Olga) who was a survivor of the Nazi extermination camp Auschwitz.
Split into simpler sentences: Emil Grunzweig was born in the town of Cluj-Napoca in Transylvania, Romania. His mother Olga was a survivor of the Nazi extermination camp Auschwitz.