In this task, we ask you to elaborate the sentence without changing its general meaning. You can do so by explaining further the input sentence, using more precise wording, adding qualifiers and auxiliary information etc.

Machaut wrote a mass known as " Messe de Nostre Dame " .
Machaut wrote the " Messe de Nostre Dame " , the earliest known complete setting of the Ordinary of the Mass attributable to a single composer .

The President of Ecuador is the chief of state and the head of government in the country .
The President of Ecuador officially called the President of the Republic of Ecuador serves as both the head of state and head of government of Ecuador , is the highest political office in the country as the head of the executive branch of government .

The Arizona Territory was an American territory from February 24 , 1863 to February 14 , 1912 .
The Territory of Arizona ( also known as Arizona Territory ) was a territory of the United States that existed from February 24 , 1863 until February 14 , 1912 , when the remaining extent of the territory was admitted to the Union as the state of Arizona .