Bringing content from another website

Hey, I tried looking for this type of topic here but couldn’t simply because I don’t know the right terms.

I need to create a website for a friend who is a real estate agent. The agency he works for has a website where they display the properties he sells and I would need to bring the properties from their site to his so that they would automatically update/add/delete from his site.

I already got an xml file from the agency’s webmaster where there should be all I need to execute this, but I’m struggling to understand where to start.

I suppose there is a plugin to do this in a more simple manner but I really need guidance.

Thanks.