Complex sentence: In 1891, Steiner received a doctorate in philosophy at the University of Rostock, for his dissertation discussing Fichte's concept of the ego, submitted to, whose "Seven Books of Platonism" Steiner esteemed.
Split into simpler sentences: In 1891, Steiner received a doctorate in philosophy at the University of Rostock. He submitted his dissertation, discussing Fichte's concept of the ego, to, whose "Seven Books of Platonism" Steiner esteemed.