Complex sentence: Avinoff was born in Tulchyn, Podolia Governorate, now Ukraine, to a wealthy Russian family with ties to nobility who served a diplomatic role in the Nicholas II of Russia's court.
Split into simpler sentences: Avinoff was born in Tulchyn, Podolia Governorate, now Ukraine. He was from a wealthy family in Russia with ties to nobility, and served a diplomatic role in the Tsar's court.