estaban conduciendo
Imperfect progressive ellos/ellas/ustedes conjugation of conducir.

conducir

Dice que las armas iban a ser utilizadas en un intento de derrocar a Castro que hubiera coincidido con operaciones navales que se estaban conduciendo en el mar Caribe por el ejército norteamericano.
He said the weapons were supposed to be used in an attempt to oust Castro that would have coincided with U.S. Navy operations being conducted in the Caribbean Sea.
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