Complex sentence: His "A Discourse of Trade", written five years later, was much more significant, however: as a broad explanation of his economic and political views, it brought together all of his ideas and became the basis for his reputation as an economic theorist.
Split into simpler sentences: His "A Discourse of Trade", written five years later, was much more significant, however. As a broad explanation of his economic and political views, it brought together all of his ideas and became the basis for his reputation as an economic theorist.