Simplify the following text for a Grade 12 native English-speaking person.
Original: He served as a delegate to the Continental Congress where he signed the Declaration of Independence , as Governor of Connecticut , and later as the first President of the United States in Congress Assembled , that is , the presiding officer of the Congress of the Confederation , the sole governing body of the first central government of the United States of America .
Simplified: As a delegate to the Continental Congress , he signed the Declaration of Independence and the Articles of Confederation .