Complex sentence: In 19th century Canadian politics, reciprocity was the term used to describe the concept of free trade with the United States of America and was promoted as an alternative to Sir John A. Macdonald's National Policy.
Split into simpler sentences: In 19th century Canadian politics, reciprocity was the term used to describe the concept of free trade with the United States of America. It was promoted as an alternative to Sir John A. Macdonald's National Policy.