is adding the comma before was necessary?
a project involving training for children, teachers, and parents(,) was the most effective
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Never separate the subject from its verb. A parenthetical insertion is possible — as in your other question — but rare. Here, you're separating the qualified project from was.– Andrew Leach ♦Commented Oct 27, 2021 at 10:27
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1 Answer
My gut tells me to leave it out as you are neither adding a new item (I.e. commata to enumerate different entities) nor are you closing a parenthesis.
Similarly, if the enumerarion of persons is removed, it reads fine for me:
...a project was the most effective.
