Simplify the following text for a Grade 6 native English-speaking person.
Original: Although this provoked no widespread outrage in Europe as the fall of Jerusalem in 1187 had done , Louis IX of France organized a crusade against Egypt from 1248 to 1254 , leaving from the newly constructed port of Aigues-Mortes in southern France .
Simplified: Louis IX of France started a crusade against Egypt from 1248 to 1254 .