estuvieron sucediendo
-they/you were happening
Preterite progressiveellos/ellas/ustedesconjugation ofsuceder.

suceder

Aunque ya se había reportado hace más de un año que los residentes de las comunidades indígenas se estaban organizando, estuvieron sucediendo demasiadas acciones como para que las áreas rurales recibieran mucha atención.
Although it was reported as long ago as last year that residents of the indigenous communities were organizing, too many actions were going on in the big cities for the rural areas to receive much attention.
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to dive