Simplify the following text for a Grade 10 native English-speaking person.
Original: After World War I ended with the armistice ( ceasefire ) of November 11 , 1918 , the armed forces were called Friedensheer ( peace army ) in January 1919 .
Simplified: After World War I ended with the armistice of 11 November 1918 , the armed forces were dubbed Friedensheer ( peace army ) in January 1919 .