Complex sentence: They conclude by arguing that this lack of agreement on a definition is not necessarily a problem for the subject but suggest that the particular definition used may well reflect the direction which the particular authors see economics evolving or the direction they would like to see it evolve.
Split into simpler sentences: They conclude by arguing that this lack of agreement on a definition is not necessarily a problem for the subject. They suggest that the particular definition used may reflect the direction that particular authors see economics evolving in, or the direction they would like to see it evolve.