Formal:
* Juan es de China, él es chino. (This is the most common and grammatically correct way to say it.)
Informal:
* Juan es de China, es chino. (You can omit "él" in informal situations)
Breakdown:
* Juan: This is the name, it stays the same in Spanish.
* es de: This means "is from"
* China: This is the country, it stays the same in Spanish.
* él: This means "he"
* es: This means "is"
* chino: This means "Chinese"
Note: In Spanish, the adjective "chino" (Chinese) agrees in gender with the noun it modifies. Since Juan is male, we use the masculine form "chino."