I work on an app which uses multiple views very often. The users workflow will make them switch between different tabBar tabs all the time.
When using it in a potential live environment, this would be really disrupting.
iOS 9 is quite promising because of the new split screen feature.
So would it be possible to display two instances of UIScreen and place both of them in an individual screen?
After working with the iPad Pro simulator for a bit, I can tell you that your app will not be able to use both sides of the split screen.
If you want to use all of the screen space you could consider using UIPageViewController with two page view controllers for the left and right sides.