RobH_en_tn/isa/06/11.md

Until cities crash into ruins and are without inhabitants, and the houses are without people

"Until all the cities and houses are ruined and no one lives there"

the land falls into a desolate waste

Here "falls into" is an idiom that means to become something worse. Alternate translation: "the land becomes a desolate waste" (See: rc://en/ta/man/translate/figs-idiom)