Simplify the following text for a Grade 9 native English-speaking person.
Original: The Dragunov sniper rifle ( formally , Snayperskaya Vintovka Dragunova ( SVD ) , literally `` Dragunov 's sniper rifle '' ) is a semi-automatic sniper rifle\/designated marksman rifle chambered in 7.62 x54mmR and developed in the Soviet Union .
Simplified: The Dragunov sniper rifle is an sniper rifle that was originally developed by Soviet Union .