Complex sentence: Leonid Borisovich Kogan (November 17 1924-December 17 1982) (Russian: Леонид Борисович Коган) was a violin virtuoso, and one of the 20th century's most famous Soviet violinists.
Split into simpler sentences: Leonid Borisovich Kogan (November 17 1924-December 17 1982) (Russian: Леонид Борисович Коган) was a violin virtuoso. He is one of the 20th century's most famous Soviet violinists.