Complex sentence: But contrary to Denethor's forebodings, Faramir recovered; moreover when Aragorn became King, he not only confirmed the Stewardship to Faramir and his succesors, but raised their rank to Princes of Ithilien.
Split into simpler sentences: But contrary to Denethor's forebodings, Faramir recovered, and the Stewardship was not emasculated. Indeed when Aragorn became King, he not only confirmed the Stewardship to Faramir and his succesors, but raised their rank to Princes of Ithilien.