"Splitting a Dice Pool" does not actually mean splitting your dice pool -- it means taking multiple actions at a cumulative penalty for each action, starting out by losing a number of dice equal to the number of actions you will take in this turn. A table showing how many dice to subtract from actions:

ActionsDice subtracted, in order

-- Note sure if it should be here or elsewhere on the site, but there should be the obligatory note that difficulty refers to number of successes and target number refers to what you need to roll. It is a common misconception amongst Wo D players than swap over to Exalted, even though it is written in black and white in the core book. While it will be better thanks to Wo D 2.0, it still bears noting. Also, there is the semi-confusing fact that difficulty actually operates as 'subtract stated difficulty-1 from the roll and if you have successes left over, that is your margin of success'. Lets see if I can write this up.

'Difficulty of actions'
Unlike White Wolf's original World of Darkness games, or their Dark Ages line, Exalted adjusts the difficulty of actions through two distinct mechanisms, Penalties and Difficulties.

These are applied due to external circumstances which cause the individual to operate at below his peak performance. Distractions due to pain, shoddy equipment and the like all inflict penalties. These subtract dice from the character's dice pool. When penalties are applied against an Exalt, they cannot (unless otherwise noted) reduce the Exalt's pool below his permanent Essence rating.
Example: This can be written later

When a dice roll is made, the number of dice showing 7 or higher is a success, with tens counting twice (unless you are an Extra). However, the fact that there is a success does not automatically that your task is successful. Some tasks are more difficult than others, and this is applied as a penalty to the number of successes that are rolled. Convincing a firebrand preacher to abandon his god simply because you think that your god is better is more difficult than convincing a dejected worshipper to change gods after his god failed to prevent his home being destroyed.

The standard difficulty is 1 and this means that all successes rolled on the dice count towards the efficacy of the endeavour. This means that the success penalty is equal to one less than the stated difficulty.
Example: Li Mui is fighting against Thousands Hands of Shadow. Thousand Hands of Shadow has assumed the Ebon Shadow Form, which inflicts a penalty to all attack rolls against him equal to his permanent Essence (3). Li Mui's player makes an attack roll and counts up 5 successes. This is reduced to 3 successes by the effects of Ebon Shadow Form because one less than the stated difficulty of 3 is 2.