Why was the peace between England and France replaced by a prolonged Hundred Years War?

This is due to the fact that there were territorial disputes between the countries, and the king of England began to claim the French throne. Thus, in 1337, a major conflict was unleashed. The initial stage of the war was lost by the French, which almost led France to decline. A third of the territories fell under the rule of England. Only after the weakening of England, the French were able to level the struggle and regain the lost territories.