For most of the prelude to the American Revolution, William Pitt was not much involved in politics as he was out of power and was getting old and somewhat frail. However, as the crisis grew, he used his place in the House of Lords to speak out.
Pitt did not want the colonies to become independent. However, he also did not want to be as harsh and uncompromising with regard to the colonists' demand as others did. He advocated a compromise with the colonies in which they would remain loyal to Britain but would be guaranteed most of the rights they wanted like the right to have their own legislature, the right to be free from taxation without representation, and the right to trial by jury.
Pitt's proposals were, of course rejected by the government. From his proposals, though, we can see that he wanted to give the colonists what he saw as their fundamental rights.