Complex sentence: In 1904 in Heidelberg he founded with Albrecht Dieterich the Eranos circle, with members including such luminaries as Ernst Troeltsch, Max Weber, Eberhard Gothein, Georg Jellinek, Karl Rathgen, and Wilhelm Windelband.
Split into simpler sentences: In 1904 in Heidelberg he founded with Albrecht Dieterich the Eranos circle, with members including Ernst Troeltsch and Max Weber. Others involved were Eberhard Gothein, Georg Jellinek, Karl Rathgen, and Wilhelm Windelband.