"Older cities like london changed dramatically when people began pouring in after the industrial revolution." Explain the statement

As the factories developed in the city and its outskirts, the people from villages started migrating to these areas in search of jobs in these factories. In the same way housing in the old cities like London changed dramatically from a sparsely populated area to a densely populated area as the people from the villages started migrating here.All this happened due to the Industrial Revolution that took place in England.