When the iPad first came out, I recall that Apple frowned upon the use of a Split View inside of Tab Bar Item View. Whether or not they rejected applications that used this design I don't recall or know anything of.
Is this design still frowned upon by Apple? If you create an application that uses this design will it be rejected by Apple? I know there are third-party API's now that help you write applications that utilize this design pattern which leads me to believe that Apple no longer cares, but I just wanted to be sure about this.
If anyone can shed some light on why Apple frowned upon this design that would be helpful because I don't understand what about this design was an issue for Apple.
I can't find the citation at the moment, but there used to be a section in the HIG that said that you must not do this, and then they changed it to one saying you should try to avoid doing this. So I think you're clear, as long as the design makes sense. Sadly I can't find where that phrase occurred — maybe it was taken out all together.
At any rate, there's nothing in the HIG under either tab bar or split view that says you can't do what you want.