estaban dividiendo
Imperfect progressive ellos/ellas/ustedes conjugation of dividir.

dividir

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Era una de las cosas que hacía que perseguir y entender a la banda fuese tan difícil: siempre se estaban dividiendo, reagrupando y volviéndose a dividir, siempre en pequeños grupos.
It was part of what made their band so difficult to track and comprehend: they were constantly splitting up, regrouping, and splitting up again, always in small groups.
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