as to that, today's student cannot discover who “chose” mr. hopkins for his role. however, he finds that mr. hopkins in his youth had absorbed the same kind of ideas (those of “louis blanc and the revolutionaries of 1848”) which mr. house acquired in his texan boyhood.

How would the previous sentence be correctly capitalized?
As to that, today's student cannot discover who “chose” Mr. Hopkins for his role. However, he finds that Mr. Hopkins in his youth had absorbed the same kind of ideas (those of “Louis Blanc and the revolutionaries of 1848”) which Mr. House acquired in his Texan boyhood.