Complex sentence: He first became famous by winning a local talent contest ("Amateur Night") at the Apollo Theater, Harlem, New York in 1952, led to a recording contract with RCA and then with Jay-Dee.
Split into simpler sentences: He first became famous by winning a local talent contest ("Amateur Night") at the Apollo Theater, in Harlem, in 1952. This led to a recording contract with RCA and then with Jay-Dee.