It was decided that in return for Louis IX supporting the Pope militarily, the Pope would allow Beatrice of Provence to marry Charles of Anjou, youngest brother to the French King, however Provence was to never go to France outright through Charles.
The Pope would allow Beatrice of Provence. This is to marry Charles of Anjou to the French King. This is in return for Louis IX. This Louis IX is supporting the Pope militarily. This was decided. Anjou was youngest brother. Provence was to never go to France outright through Charles.