Original: Isaac Bashevis Singer (November 21, 1902 (see notes below) – July 24, 1991) was a Polish-born Jewish American Nobel Prize-winning  author and one of the leading figures in the Yiddish literary movement.
Simplified: Isaac Bashevis Singer (November 21, 1902 – July 24, 1991) was a leading author in the Yiddish literature.