Simplify the following text for a Grade 8 native English-speaking person.
Original: The younger sister of professional tennis players Valeria and Alyona Bondarenko , she was born in Kryvyi Rih , Ukraine , then part of the Soviet Union .
Simplified: The younger sister of Alyona Bondarenko , she was born in Kryvyi Rih , Ukraine , then part of the Soviet Union .