3 sentences

1. 长孙无忌是唐朝著名的宰相。

   Zhǎng​sūn Wú​jì shì Táng​cháo zhù​míng de zǎi​xiàng.

   Zhangsun Wuji was a famous chancellor of the Tang Dynasty.

   Source: Dong Chinese Dictionary

2. 宰相在古代中国拥有极大的权力。

   zǎi​xiàng zài gǔ​dài Zhōng​guó yōng​yǒu jí dà de quán​lì.

   The prime minister held immense power in ancient China.

   Source: Dong Chinese Dictionary

3. 在古代，宰相的主要职责之一是辅政。

   zài gǔ​dài, zǎi​xiàng de zhǔ​yào zhí​zé zhī​yī shì fǔ​zhèng.

   In ancient times, one of the main duties of the prime minister was to assist in governing the state.

   Source: Dong Chinese Dictionary