Both of them are examples of the passive voice, the present continuous tense, and a reduced relative clause.
The passive voice is created by using to be and the past participle of the verb. The verb in this case is to make, so the past participle is "made".
It's the present continuous tense because the form of to be is "is being".
It's a reduced relative clause because you could rewrite them with a relative pronoun and a be verb, like
PESTEC factors could have an impact on the decision being made
PESTEC factors could have an impact on the decision that is being made
But you can leave out the pronoun and be verb (like "that is") because the verb in the relative clause is progressive ("being"); that's what makes it a reduced relative clause.