sétaient
Sétaient is a French word, a conjugated form of the verb "être," meaning "to be." Specifically, it is the third-person plural imperfect indicative form. This tense, the imperfect, is used to describe ongoing actions, habitual actions, or states of being in the past. Therefore, "sétaient" translates to "they were" or "they used to be."
For example, in a sentence like "Les oiseaux s'étaient perchés sur la branche," it means "The birds
The imperfect tense, and thus the form "sétaient," is crucial for setting the scene or providing background