Complex sentence: Petrenko married his coach Zmievskaya's oldest daughter, Nina Milken, on June 19,1992 and their daughter Viktoria was born on July 21,1997.
Split into simpler sentences: Petrenko married his coach Zmievskaya's oldest daughter, Nina Milken, on June 19,1992. Their daughter Viktoria was born on July 21,1997.