Complex sentence: The thesis criticized Herder for retaining a Biblical chronology, too shallow to allow for the observable diversification of languages, but he also argued with Herder, that all the world's languages have equal aesthetic potentials and grammatical complexity.
Split into simpler sentences: The thesis criticized Herder for retaining a Biblical chronology, too shallow to allow for the observable diversification of languages. But he also argued with Herder, that all of the world's languages have equal aesthetic potentials and grammatical complexity.