Simplify the following text for a Grade 9 native English-speaking person.
Original: There is Veteran 's Day in the United States , and Armistice Day in France , Belgium , New Zealand and other countries .
Simplified: Armistice Day was observed in New Zealand between the world wars , although it was always secondary to Anzac Day . As in other countries , New Zealand 's Armistice Day was converted to Remembrance Day after World War II , but this was not a success .