3 sentences

1. 大唐盛世，四海昌晟。

   Dà Táng shèng​shì, sì​hǎi chāng shèng.

   In the golden age of Tang, the world was prosperous.

   Source: Dong Chinese Dictionary

2. 唐朝是中国历史上的一个盛世。

   Táng​cháo shì Zhōng​guó lì​shǐ shàng de yī gè shèng​shì.

   The Tang Dynasty was a golden age in Chinese history.

   Source: Dong Chinese Dictionary

3. 旧社会已经过去，如今正是光天化日的盛世。

   jiù shè​huì yǐ​jīng guò​qù, rú​jīn zhèng shì guāng​tiān​huà​rì de shèng​shì.

   The old society is a thing of the past; today is a prosperous era of peace and justice.

   Source: Dong Chinese Dictionary