When Member States adopt these provisions , they shall contain a reference to this Directive or shall be accompanied by such reference on the occasion of their official publication The methods of making such reference shall be laid down by Member States .
The above sentence is very complicated. Please provide me a simplified synonymous version consisting of multiple sentences:
When Member States adopt these provisions , they shall contain a reference to this Directive or shall be accompanied by such reference on the occasion of their official publication . The modalities of this reference are decided by the Member States .