"This week will be the first chance for Conservative MPs to compare notes about the state of grassroots feeling over Brexit since before the recess."
(The Guardian.)
Is the prepositional phrase "before the recess" the object (complement) of the preposition "since" or is "since before" a compound preposition with its object "the recess" in the sentence above?
since before the recess . The PP "before the recess" is complement of the prep "since".
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... since before the recess.
The PP "before the recess" is complement of the prep "since".