bruce started hormone therapy and had plastic surgery to look more feminine in the late 1980s .
he was inspired by the story of transgender tennis player renee richards who was born a man and in 1976 won the right to compete as a woman .
olympic decathlete reveals he halted the gender transition process after meeting kris kardashian in late 1990 .
bruce and kris married in april 1991 and had two daughters before their divorce last december .