translate English to French: At the same time, the rest of Europe was also becoming more ethnically and culturally diverse, partly because of increased population movement within Europe, particularly from east to west, and partly because of increased immigration from outside Europe, particularly from the former colonies after they became independent in the mid-20th Century.
Parallèlement, le reste de l’Europe a gagné en diversité ethnique et culturelle, en raison de l’augmentation des mouvements de population en Europe, notamment de l’Est vers l’Ouest, et de l’immigration non-européenne, notamment en provenance des anciennes colonies depuis leur indépendance au milieu du XXe siècle.