The part of a sentence "which permit the" is correct and can be used in written English.
You can use it when referring to something that allows, or permits, another thing to take place. For example: Our new safety regulations, which permit the workers to take extra precautions, have drastically improved our work environment.
The best rides are made possible by independent suspension systems, which permit the wheels to move independently of each other.
Green rods in the retina, which permit the perception of a wide range of wavelengths, are found only in lissamphibians.
Amnesty said such charges did not meet international legal standards, which permit the death penalty only for the "most serious crimes".
It created new offences, which permit the courts of this country to deal with terrorist acts and their planning, wherever in the world those acts are carried out.
They also heard about the latest techniques for the chemical analysis of paint, which permit the analyst to nail down when a work was painted.
In the meantime the Agriculture Department has issued guidelines for the products it regulates -- meat and poultry -- which permit the use of terms such as "carb conscious" and "carb wise," terms that do not imply a specific level of carbohydrates.
It's a big moment right now for very small things, which permit the very persuasive illusion that you're eating only very small amounts while you're in fact racking up very large quantities of food.
That is why we have - patiently and with full regard for religious concerns - sought to introduce clear laws which permit the use of stem cells within a clear, managed, legal framework, subject to the strictest supervision.
It is the United States Constitution and international law, which permit the government to use lethal force in response to truly imminent threats but do not support the current killing policy.
Care must be taken when making wine specifically for the more air-deprived environment of screw caps rather than cork-topped bottles, which permit the interchange of tiny amounts of air.
Geographically extensive and numerically large families may result from major technological innovations, such as the adoption of cultivation, which permit the community of innovators, and its language, to expand at the expense of neighbouring groups.
