Complex video editing app for iPhone?

I'm looking to find an app for my iPhone 4S which will allow me to record separate videos and than compile them together so that I can watch them back at the same time on one screen, essentially acting as one video showing a collage of 2 or more other videos playing simultaneously.
I can't be sure that such an app actually exists, but if anybody knows of one that will allow me to do this could you please please let me know!

I use iMovie its 4.99 but the best video editing app out there

I edit my youtube vids on my 4s just buy imovie or videoshop if you want something free

No one does serious editing on a little phone screen, do it on your desktop there are tons of video editing porgrams including windows movie maker.

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