Simplify the following text for a Grade 16 native English-speaking person.
Original: The movement had extended itself beyond Europe and North America to Central and South America ( Argentina , Brazil , Chile , Cuba , Mexico , Peru , El Salvador , Uruguay , Venezuela ) , Asia ( the Republic of China , Japan , Korea , Siam ) , and Africa ( Republic of South Africa ) .
Simplified: The movement had grown beyond Europe and North America to Central and South America ( Argentina , Brazil , Chile , Cuba , Mexico , Peru , El Salvador , Uruguay , Venezuela ) , Asia ( the Republic of China , Japan , Korea , Siam ) , and Africa ( Republic of South Africa ) .