hubieran certificado
-they/you had certified
Past perfect subjunctiveellos/ellas/ustedesconjugation ofcertificar.

certificar

Uno de los limítrofes fuertes fue, en el principio, que habían pocos ejemplos de pesquerías que ya se hubieran certificado y nos dieran una idea de qué podría servir, cuáles podrían ser los problemas.
One of the limitations we had in the beginning was that there were few examples of fisheries that had been certified, that could give us an idea of how certification could help and what problems we might have.
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to bake