3 sentences

1. 他在这家公司掌管人事部门。

   tā zài zhè jiā gōng​sī zhǎng​guǎn rén​shì bù​mén.

   He is in charge of the human resources department in this company.

   Source: Dong Chinese Dictionary

2. 大司马在古代是掌管军事的高官。

   dà​sī​mǎ zài gǔ​dài shì zhǎng​guǎn jūn​shì de gāo​guān.

   The Da Sima was a high-ranking military official in ancient times.

   Source: Dong Chinese Dictionary

3. 他这些年一直替父亲掌管着家族公司的财务。

   tā zhè​xiē nián yī​zhí tì fù​qīn zhǎng​guǎn zhe jiā​zú gōng​sī de cái​wù.

   He has been managing the family company's finances for his father over the years.

   Source: Dong Chinese Dictionary