estuvieron experimentando
-they/you were experiencing
Preterite progressive ellos/ellas/ustedes conjugation of experimentar.

experimentar

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Con suerte, ahora esto va a comenzar a tener sentido y empezar a darle sentido a lo que algunos de ustedes estuvieron experimentando.
Hopefully this is now going to start to make sense and begin to come together in what some of you have been experiencing.
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