Simplifier belong to the 1
st group. Simplifier is a common french verb.
Simplifier is conjugated the same way that verbs that end in :
-ier
Simplifier is conjugated with
auxiliary avoir.
Simplifier verb is
direct transitive, intransitive.
French verb simplifier can be conjugated in the reflexive form:
Se simplifier
Simplifier verb is a direct transitive verb, so passive voice can be used.