QUES: This system was greatly altered by the United States over the last decade

correct the punctuation.

CORRECTED: This system was greatly altered by the United States over the last decade.

QUES: The discovery of this origin was through linguistics

correct the punctuation.

CORRECTED: The discovery of this origin was through linguistics.

QUES: Today the Danish Presidency has reached agreement with the European Parliament on a regulation on the Internal Market Information System the IMIsystem

correct the punctuation.

CORRECTED:
Today, the Danish Presidency has reached agreement with the European Parliament on a regulation on the Internal Market Information System (the IMI-system).