Complex sentence: Jacqueline Susann (August 20,1918--September 21,1974) was an American author, whose first novel "Valley of the Dolls" sold 30 million copies, after being rejected by several publishers who did not want to feature young female drug addicts.
Split into simpler sentences: Jacqueline Susann (August 20,1918--September 21,1974) was an American author, whose first novel "Valley of the Dolls" sold 30 million copies. The book had been rejected by several publishers who did not want to feature young female drug addicts.