3 sentences

1. 他在东汉时期担任过郡太守。

   tā zài Dōng​hàn shí​qī dān​rèn guo jùn tài​shǒu.

   He served as a commandery governor during the Eastern Han Dynasty.

   Source: Dong Chinese Dictionary

2. 曹操是东汉末年的著名政治家。

   Cáo cāo shì Dōng​hàn mò​nián de zhù​míng zhèng​zhì​jiā.

   Cao Cao was a famous statesman at the end of the Eastern Han Dynasty.

   Source: Dong Chinese Dictionary

3. 曹操在东汉末年统一了中国北方。

   Cáo Cāo zài Dōng​hàn mò​nián tǒng​yī le Zhōng​guó běi​fāng.

   Cao Cao unified Northern China at the end of the Eastern Han Dynasty.

   Source: Dong Chinese Dictionary