In one of the tests I took, I answered this question wrong:"Qu'est-ce que c'est que la Sorbonne?" means__
My answer was "What is it that is the Sorbonne."
Now I know the correct answer is "What is the Sorbonne?"
My question is why the original question should not have been "Qu'est-ce que c'est la Sorbonne?"
What is the need for a second que after c'est?