Complex sentence: Bonnie Koloc is a Chicago-based American folk music singer-songwriter who made her recording debut in 1971, three years after several popular recordings by Melanie, who had released her first album in 1968 with a folk/pop blend.
Split into simpler sentences: Bonnie Koloc is a Chicago-based American folk music singer-songwriter who made her recording debut in 1971. In 1968 Melanie, released her first album in 1968 with several popular songs with a folk/pop blend.