Complex sentence: On October 18,1874 Naumenko married Vira Mykolaivna Shulhina, an aunt of Oleksander Shulhyn, who at that time graduated from the Kiev Institute of noble girls.
Split into simpler sentences: On October 18,1874 Naumenko married Vira Mykolaivna Shulhina, an aunt of Oleksander Shulhyn. At that time she graduated from the Kiev Institute of noble girls.