Simplify the following text for a Grade 10 native English-speaking person.
Original: Vasily Grigorevich Zaytsev ( , ; March 23 , 1915 â `` December 15 , 1991 ) was a Soviet sniper during World War II , notable particularly for his activities between November 10 and December 17 , 1942 during the Battle of Stalingrad .
Simplified: Captain Vasily Grigoryevich Zaytsev ( March 23 , 1915 â `` December 15 , 1991 ) was a Soviet sniper during World War II . He is particularly notable for his activities between November 10 and December 17 , 1942 during the Battle of Stalingrad .