Here "nations" refers to the people from those nations that pass by. AT: "Then many people from various nations will pass by this city" (See: [[rc://en/ta/man/translate/figs-synecdoche]])
These two phrases mean the same thing. The phrase "bowed down" describes the posture that people used in worship. AT: "they worshiped other gods" (See: [[rc://en/ta/man/translate/figs-doublet]] and [[rc://en/ta/man/translate/translate-symaction]])