"Hungarian sportsmen are good."

Translation: A magyar sportolók jók.

[PhiDoBas]

Why the article "a"? why not just "magyar sportolók"

[vvsey]

Because Hungarian has its own rules. And those require the article, unlike English.

[KlausFendt]

Why isn't there no "vannak" at the end of the sentence?

[tomklemm]

"jók" means here "they are good", so the "vannak" is not used. This is often so.