たべほうだい
all-you-can-eat
tabehoudai
このthisおみせお店restaurantはたべほうだい食べ放題all-you-can-eatです
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.