Complex sentence: Riklis is widely credited with launching (or buying) her career as a celebrity, for not long after their marriage, she made her breakthrough as the Dubonnet Girl, appearing in print and television commercials for the apéritif distributed by a company he owned.
Split into simpler sentences: Riklis is widely credited with launching (or buying) her career as a celebrity. Not long after their marriage, she made her breakthrough as the Dubonnet Girl, appearing in print and television commercials for the apéritif distributed by a company he owned.