If you ask your students to ask such complex questions, why not explain to them the grammar terms, as well. Do not be afraid of it, since they probably know these terms in their own language anyway (I am speaking from my own experience as a student of English), so they will catch up with you sooner than you think. I would definitely give your students the scheme of the object question form (i.e., question word + Auxiliary Verb + Subject + Verb) and start from there.
If you really do not want to start using grammar terms, I would suggest asking easier questions, which are also easier to explain. Then practice asking questions using as many examples as you can, so they figure it out on their own.
I know that it is not what you asked, but I really believe that this is the right way to go.
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