Acceleration Event means the occurrence of an Event of Default (a) in respect of which Agent has declared all or any portion of the Obligations to be immediately due and payable pursuant to Section 10.2, (b) pursuant to Section 10.1(a), and in respect of which Agent has suspended or terminated the Revolving Loan ..

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Spanish term (edited): verificándose un supuesto de Evento de Aceleración

The weak verb of verificarse - like su(b)stanciarse controversially in a recent question - means, transitively, to take place, though I have turned the verb into a transitive one of triggering for stylistic purposes.

Un supuesto IMO overlaps with un Evento and means 1. a supposition, assumption or 2. situation, *scenario* or event (West).

Aceleración: acceleration implying accelerated maturity or due date of the Debts under the Certificates: Deuda de los Certificados.

The CLs - confidence levels at the moment - go 4-3-2 for the sake of numerical consistency, albeit ought to be the other way up.

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Note added at 1 day 20 hrs (2019-12-07 19:57:31 GMT)
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- means, intransitively,.....

"verificándose" just means "there is"
so, from "verificándose" onwards could be translated as .
"this constituting an Acceleration Event under the terms of the Trust"