Just my 2 cents worth, and educated advice, others may have a different idea.
I don't see why you want to do this. The MS2 track box has two controller recepticles. You can divied blocks the same way as with one controller, or a CS2 or CS3. A very large layout with several blocks may rquire a digital booster. However, the MS2 can run 5 sound Locomotives at once, not including car lighting, and signals or other contant power consuming accessories. You must be careful that track blocks of any type are well insulated when using more than one power supply, regardless of controller. Ambient temperature fluctuations make tracks expand and contract. This can and usually will often result in insulators moving and not insulating the block sections. That can be fatal to a modern controller, and or power supply. You must also only use a switched mode power supply with the MS2, and CS3's.
The CS 3's include a powerful booster, and their designated power packs have plenty of amperage to run everything. Only the largest of layout will require an additional booster.

This is very easy to do!
You have to use just ONE power and ONE MS2 controller.
Simply draw a brown and a red cable between the two tracks. Connecting them in parallel.

You could make them yourself, but you may find the 74042 is an alternative to doing this.

If the two tracks are connected by switch tracks, the power will be shared between the two tracks. If you decide to either divide the circuit using boosters, you can either power one track from the MS2 and the second via the booster and simply isolate between the tracks or you can use the MS2 to control the front of the layout (both tracks) and the booster to control the rear.
The advantage of using a booster would be in cases where you have multiple locomotives, ie in a station or yard or trains with multiple locomotives.

Regards

Mike C