我建议你回国。因为是中国造就了你，你学有所成后就得回来发展国家

I suggest you return to China, because China is what made you. You should seek to benefit your country with the knowledge that you've gained.

I suggest/advice you to return to your country, because it was China that brought you up, then you must return to China to contribute for its development after you had finished learning.

我建议你回国。因为是中国造就了你，你学有所成后就得回来发展国家
I suggest you return home from abroad, because China brought you up and you must return home to devote yourself to the country.