3 sentences

1. 鞑靼是古代中国北方的一个游牧民族。

   Dá dá shì gǔ​dài Zhōng​guó běi​fāng de yī gè yóu​mù mín​zú.

   The Tatars were a nomadic people in northern ancient China.

   Source: Dong Chinese Dictionary

2. 唐朝时期，突厥曾是北方强大的游牧民族。

   Táng​cháo shí​qī, Tū​jué céng shì běi​fāng qiáng​dà de yóu​mù mín​zú.

   During the Tang Dynasty, the Turks were a powerful nomadic group in the north.

   Source: Dong Chinese Dictionary

3. 由于生存环境变得恶劣，这支游牧民族决定整体向南方迁移。

   yóu​yú shēng​cún huán​jìng biàn de è​liè, zhè zhī yóu​mù mín​zú jué​dìng zhěng​tǐ xiàng nán​fāng qiān​yí.

   Due to the deteriorating living environment, this nomadic tribe decided to migrate southward as a whole.

   Source: Dong Chinese Dictionary