Complex sentence: Many of the published sources (cf Auden) have further rearranged the material; however, the version found in the Codex Regius appears to many to be more logical that the rearranged versions.
Split into simpler sentences: Many of the published sources (cf. Auden) have further rearranged the material. However, many find the version found in the Codex Regius to make more sense than these rearranged versions.