2 sentences

1. 匈奴的最高首领称为单于。

   Xiōng​nú de zuì gāo shǒu​lǐng chēng​wéi chán​yú.

   The supreme leader of the Xiongnu was called the Chanyu.

   Source: Dong Chinese Dictionary

2. 匈奴曾是秦汉时期中国北方的一个强大民族。

   Xiōng​nú céng shì Qín Hàn shí​qī Zhōng​guó běi​fāng de yī gè qiáng​dà mín​zú.

   The Xiongnu were once a powerful ethnic group in northern China during the Qin and Han dynasties.

   Source: Dong Chinese Dictionary