Complex sentence: His father, Amanullah Jahanbani was a lieutenant general, who served in the Persian Cossack Brigade with Reza Shah Pahlavi, and his mother was from the Russian aristocracy in Petrograd.
Split into simpler sentences: His father, Amanullah Jahanbani, was a lieutenant general, who served in the Persian Cossack Brigade with Reza Shah Pahlavi. His mother was from the Russian aristocracy in Petrograd.