Complex sentence: She had met Gustavo Bern, a plastic surgeon who worked with Duran government who served on the judge panel for Queen of Duran and convinced her to become his assistant when he promised her to get surgery, and at first she refused, but later she agreed.
Split into simpler sentences: She had met Gustavo Bern, a plastic surgeon who had worked with Duran government, and had also served on the judges panel for Queen of Duran. He had convinced her to become his assistant when he promised her surgery, and at first she refused, but later she agreed.