Original sentence: Because the government uses the tax code as an instrument of social policy, the code as a whole appears to some critics to lack a coherent organizing principle.The purported lack of a coherent organizing principle arguably has become magnified over time, due to the interplay between successive legislative amendments and regulatory changes to the law and the private sector responses to those amendments and changes
Edited sentence: Because the government uses the tax code as an instrument of social policy, the code as a whole appears to lack a coherent organizing principle.This lack of a coherent organizing principle has become magnified over time, due to the interplay between successive legislative amendments and regulatory changes to the law and the private sector responses to those amendments and changes