Complex sentence: In 2015, a group of women were turned away from a film première at the Cannes Film Festival in France for wearing flat shoes, including a woman physically unable to wear heels due to an operation on one of her feet.
Split into simpler sentences: In 2015, a group of women were turned away from film première at the Cannes Film Festival in France for wearing flat shoes. One of the group was physically unable to wear heels due to an operation on one of her feet.