Whereas Article 8a of the Treaty provides that the internal market must be established by 31 December 1992; whereas the internal market comprises an area without internal frontiers in which the free movement of goods , persons , services and capital is ensured in accordance with the provisions of the Treaty.
The above sentence is very complicated. Please provide me a simplified synonymous version consisting of multiple sentences:
Article 8a of the treaty provides that the internal market is to be implemented by December 31 , 1992 . The internal market comprises an area without internal borders in which the free movement of goods , people , services and capital is guaranteed in accordance with the provisions of the treaty .