Complex sentence: She started singing with gospel groups including the Queen of Gospel Albertina Walker and Caravans, and by 1963 was working in New York on sessions and as a backing singer at the Apollo Theatre.
Split into simpler sentences: She started singing with gospel groups including the Queen of Gospel Albertina Walker and Caravans. By 1963 she was working in New York City on sessions and as a backing singer at the Apollo Theatre.