Complex sentence: She was married to English musician David Bowie, whom she assisted in conceptualizing the costumes for the Ziggy Stardust stage show, until their divorce in 1980; the couple had one child, film director Duncan Jones.
Split into simpler sentences: She was married to English musician David Bowie (whom she assisted in conceptualizing the costumes for the Ziggy Stardust stage show) until their divorce in 1980. The couple had one child, film director Duncan Jones.