The abstract noun "horror" can be expressed with the words "horrified" or "horrible." The author writes of what God did to their ancestors in terms of how other people would react when the saw what God did. Alternate translation: "he made them something that people would be horrified to see" or "he punished them horribly" (See: [[rc://en/ta/man/translate/figs-abstractnouns]] and [[rc://en/ta/man/translate/figs-metonymy]])