Original sentence: Confinement in a fortified determined use of very dense area and caused the departure of the richer merchants  out of the perimeter where it was  possible to build luxury residences  on large lots.In 1849, a riot caused a fire whose consequences will be political when, to protest against a law that critics, tories set fire to the parliament of Canada who was in the old Marché Saint-Anne on Place d'Youville.The first is radical transformation, in 1804, the destruction of the fortifications that surround the heart of Montreal
Edited sentence: Confinement in a fortified  and very dense area caused the departure of the richer merchants out of the perimeter where it was  possible to build luxury residences  on large lots.In 1849, a riot caused a fire with political consquences when, to protest against a law that critics, Tories set fire to the parliament of Canada who was in the old Marché Saint-Anne on Place d'Youville.The first radical transformation of the nineteenth century, in 1804, is the destruction of the fortifications  surrounding the heart of Montreal