"住在乡下房子的人" can be translated into English as "people who live in rural houses" or "those dwelling in country homes".
The first option, "people who live in rural houses," is more straightforward and commonly used, clearly conveying the idea of individuals residing in houses located in rural areas.
The second option, "those dwelling in country homes," is slightly more poetic or formal, using "dwelling" as a verb meaning "to live" and "country homes" to refer to houses in the countryside.