Complex sentence: Alexandr Aksakov wrote on the great variety of subjects (the most controversial of which was the nature and history of Russian drinking habits), his articles and essays appearing regularly in "The Day" (Dehn, "День") magazine edited by Ivan Aksakov.
Split into simpler sentences: Alexandr Aksakov wrote on the great variety of subjects, the most controversial of which was the nature and history of Russian drinking habits. His articles and essays appearing regularly in "The Day" (Dehn, "День") magazine edited by Ivan Aksakov.