Complex sentence: She sat in with R&B musicians and wrote songs, influenced by country music as well as the blues, before winning a recording contract with Chess Records in 1967, for whom her first single, "A Love Reputation" was a modest regional hit.
Split into simpler sentences: She sat in with R&B musicians and wrote songs, influenced by country music as well as the blues, before winning a recording contract with Chess Records in 1967. Her first single, "A Love Reputation" was a modest regional hit.