hubieran ampliado
-they/you had expanded
Past perfect subjunctiveellos/ellas/ustedesconjugation ofampliar.

ampliar

Si no fuera por la política exterior de los EEUU, nunca hubieran abandonado sus hogares, se hubieran conocido en San Francisco y hubieran ampliado sus respectivas familias.
If it weren't for U.S. foreign policy, they would have never left their homes, met in San Francisco and extended their respective families.
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to dive