Complex sentence: Goethe encouraged Schopenhauer to write "On Vision and Colors", but, after it was published, in July 1815, Goethe rejected several of Schopenhauer's conclusions, especially as to whether white is a mixture of colors.
Split into simpler sentences: Goethe encouraged Schopenhauer to write "On Vision and Colors". After it was published, in July 1815, Goethe rejected several of Schopenhauer's conclusions, especially as to whether white is a mixture of colors.