The Body of the Document: The Declaration's introduction states the philosophy upon which the colonies' decision to rebel is based. The body of the document lists the specific grievances of the colonies against the British government--the evidence. The British government's infringement upon the colonists' God given rights include preventing the passing of laws that promote the common good, calling legislative assemblies at places designed to prevent colonial leaders from attending, the dissolution of representative bodies of governments, the presence of standing armies in times of peace, the harassment of colonists by British officials, establishing unfair trade laws, denying colonists a fair trial, waging war against the colonies, and the impressment of American sailors into the British Navy.
In addition to the list of grievances, Jefferson and his committee assert that the colonists have repeatedly expressed their dissatisfaction with their treatment and that the British have done nothing about it.
Interpretation: It's important to remember that the Declaration's primary audience was not King George, but the world. In order to make their cause just, enlist the help of foreign powers, and win the sympathy of British commoners, the document's writers needed to clearly state their cause and clearly state King George's misdeeds. Jefferson understood this well. His original draft includes several more grievances than the final copy, many of which were obscure and unknown even to the most ardent supporters of American Independence.*
*For an excellent treatment on the origins of the Declaration, check out Pauline Maier's outstanding work.