Complex sentence: Dinah Cancer (born August 28,1960) is the stage name of Mary Sims, a vocalist, best known for her band 45 Grave, which helped found the musical genre known as "deathrock".
Split into simpler sentences: Dinah Cancer (born August 28,1960) is the stage name of Mary Sims. She is a vocalist, best known for her band 45 Grave, one of the founders of the genre of music known as "deathrock".