たべほうだい
all-you-can-eat
tabehoudai
このthisお店(みせ)restaurantは食(た)べ放題(ほうだい)all-you-can-eatです
This restaurant is all-you-can-eat
この (this) points at the noun right after it — お店(おみせ) (shop). は (topic) then makes that shop the topic, and the noun 食べ放題(たべほうだい) (all-you-can-eat) becomes the description, capped by the polite です (is) at the end.