estuvieron reteniendo
-they/you were keeping
Preterite progressive ellos/ellas/ustedes conjugation of retener.

retener

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Gracias al ejército de Estados Unidos y a nuestra colaboración con muchas de sus naciones, me complace informar que los sanguinarios asesinos conocidos como ISIS han sido expulsados del territorio que estuvieron reteniendo en Iraq y Siria.
Thanks to the United States military and our partnership with many of your nations, I am pleased to report that the bloodthirsty killers known as ISIS have been driven out from the territory they once held in Iraq and Syria.
Word of the Day
to splash around