Complex sentence: The tape was reportedly made with no serious intent of getting a recording deal, but was promoted by New York-based DJ Mister Cee, who had previously worked with Big Daddy Kane, and was heard by the editor of "The Source".
Split into simpler sentences: The tape was reportedly made with no serious intent of getting a recording deal. However, it was promoted by New York-based DJ Mister Cee, who had previously worked with Big Daddy Kane, and it was heard by the editor of "The Source".