Complex sentence: She had a 30-year career (she debuted in 1956 and recorded her last album in 1986, a few months before her death) and her death led to an iconic image as a tragic diva and renowned singer.
Split into simpler sentences: She had a 30-year career, debuting in 1956 and recording her last album in 1986, a few months before her death. Her death led to an iconic image as a tragic diva and renowned singer.