I think Robert, Mary Jane, Andrea, Lee Ann, and should be the members of the committee, not knowing how the different names are actually connected.
Explanation:
* Robert, Mary Jane, Andrea, Lee Ann: We use commas to separate items in a list.
* and: This word connects the list of names to the rest of the sentence. We do not need a comma before "and" in this case.
* committee: This is part of the phrase "members of the committee," so we don't need a comma here.
* not knowing: This is a participial phrase modifying the entire sentence, so it needs a comma after it.
Important Note: The sentence structure is a little awkward. It might be clearer to say:
"I think Robert, Mary Jane, Andrea, Lee Ann, and [name] should be the members of the committee, because I don't know how the different names are actually connected."