Example sentence:
Before the kids were driven to the mall, they had some sandwiches in a convenience store.
Now if we reduce the adverbial clause of the sentence, which one will be the correct construction between 1 and 2, if not both of them?
1) Before driven to the mall, the kids had some sandwiches in a convenience store.
2) Before being driven to the mall, the kids had some sandwiches in a convenience store.
My next question is, how to determine whether we should use the 'being' before a past participle in any sentence similar to the given example above?