estuvieron ocurriendo
-they/you were happening
Preterite progressiveellos/ellas/ustedesconjugation ofocurrir.

ocurrir

Veinte libros separan a Hageo y Zacarías del libro de Esdras, aunque los eventos que se registran en cada libro estuvieron ocurriendo al mismo tiempo.
Twenty books separate Haggai and Zechariah from the book of Ezra, yet the events recorded in each book were occurring at the same time.
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