hubieran nacionalizado
Past perfect subjunctiveellos/ellas/ustedesconjugation ofnacionalizar.

nacionalizar

Aquellos chilenos que por cualquier circunstancia, se hubieran nacionalizado en un país extranjero y hubieran renunciado en forma escrita y voluntariamente a la nacionalidad chilena.
Those Chilean citizens who under any circumstance, had been granted another nationality in a foreign country and had renounced the Chilean nationality in writing and voluntarily.
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