Whereas , with regard to the Member States of the European Economic Community , the undertaking to grant such exemption falls within the competence of the said Community which possesses the necessary powers for this purpose by virtue of the Treaty establishing the Community.
The above sentence is very complicated. Please provide me a simplified synonymous version consisting of multiple sentences:
Any autonomous or contractual derogation from the Common Customs Tariff falls under the exclusive competence of the Community . By adding an Additional Protocol to the Convention , the European Economic Community can become a party to the Convention and in this way exercise its competence .