Split Dice Pools, What is split, how and where do the rules mention it? Options

[Llewelyn]

So I have seen a number of posts talking about how attacking with two weapons has its pros and cons. One of the pros in particular is that you split the dice pool then add modifiers. But I can't seem to find that anywhere in the rules, I have the 20th Anniversary. I have only seen where it talks about what a dice pool is Skill + Attribute + modifiers and that when doing multiple attacks you split your dice pool, but nothing that says what the dice pool consists. Logically from the definition of the dice pool at the start of the rules it would seem like you would add modifiers then split that total so the sum of the split pools equaled the starting total.

Specifically I am looking for a reference from the book, I prefer the idea of the dice pool being affected by the modifiers after the split, but just can seem to find it in the rules. Any help is appreciated.

Thanks