The phrase "easy classification" means the ability to categorize or group things without much difficulty or complicated thinking involved. Full definition
The exact composition varies and it escapes easy classification. (blog.politics.ox.ac.uk)
Apps can be organized into folders for easy classification. (techpp.com)
But his work as a senior fellow at the Council on Foreign Relations defies easy classification as interventionist, neoconservative or idealist. (religion-online.org)