Pre-compose, mask, animate, use a simple linear wipe. No magic involved, just basic techniques.
Precompose the layers you want to move, draw a mask, animate position. This is real basic AE.
If there are elements the you want in both sides of the split then you'll have to duplicate those and include copies in both pre-comps.
If you are new to AE and confused please be more specific about what parts of this comp you need to include in each side of the screen. Your screenshot does not explain what is going on in the composition.
I figured it out, thanks guys!
However I do have another question, what is the easiest way to create the line transition in that as the line rotates, the type that the line crosses vanishes? I'm not sure that this makes sense but it's worth a try.
one easy way to do it:
1. you create a mask on the layer you want to vanish behind that line (i.e your text) as it wipes through.
2. you animate that mask according to the line. you can easily do that with animating the transform box of the whole mask shape
the more precise way but maybe more complicated for beginners would be:
1. you create a solid layer with a mask that will be the matte for you text layer
2. you parent it to the rotation line
3. you set your text to use this solid as an alpha matte