Original sentence: The Security and Prosperity Partnership of North America is a continent-level agreement, founded on March 23, 2005 by the heads of state of Canada, Mexico and the United States, to enhance security and economic cooperation in North America
Edited sentence: The Security and Prosperity Partnership of North America is a continent-level agreement, founded on March 23, 2005 by the heads of state of Canada, Mexico and the United States.The purported reason for this agreement is to enhance security and economic cooperation in North America