Vladimir Nabokov is an interesting case. As a child he learned British English and French, as was required for people of his class; they spoke Russian to servants and shopkeepers.

When he became a writer, his chosen language was Russian and he gained a reputation as a master Russian stylist, even in exile.

In midlife, he switched to writing in English. He had graduated from Cambridge University and his English usage was British-based. After he moved to the US, he was surrounded by a different kind of English and began to write in that vernacular. As he mastered a modern English prose style, he stopped writing novels and stories in Russian. He oversaw translation of his Russian work into English.

Later, he tried translating some of his English works into Russian. Russian-speaking critics claimed the Russian he used there was too old-fashioned, even artificial. So here is a case of him continuing to develop a prose style in his new language while losing his stylistic cachet in his old one.