I don't see any guarantee here that splitting a business will create jobs.

1) Business A has 1B in profits with X number of employees, gets taxed.

2) Business B splits into 10 businesses with 100M in profits and X/10 number of employees per business unit, and doesn't get taxes.

Maybe we should require that everyone break at least one window on their house once a year. This would create a lot of great window repair jobs.

This is the broken window fallacy. If our goal is to increase employment rates then we should support policies that do so where human productivity is most efficient.

Substantial job creation of ceo and accountant positions, that is. Shell companies do not really employ people.

I think you mis-understand just how easy it is to create a corporation with no employees...

Can you elaborate? It seems to me that if a single corporation just split their operations into multiple separate child corps, it wouldn't necessarily result in job creation. (Duplicated positions could just be contracted to a single company in the group, for instance.)

Presumably you’ve never heard of shell corporations. Child companies do not imply jobs.