4 sentences

1. 新市长今天正式上任。

   xīn shì​zhǎng jīn​tiān zhèng​shì shàng​rèn.

   The new mayor officially took office today.

   Source: Dong Chinese Dictionary

2. 新经理上任后正式接管了公司的日常业务。

   xīn jīng​lǐ shàng​rèn hòu zhèng​shì jiē​guǎn le gōng​sī de rì​cháng yè​wù.

   The new manager formally took over the company's daily operations after taking office.

   Source: Dong Chinese Dictionary

3. 新领导层上任后，立即对贪腐官员进行了大规模清洗。

   xīn lǐng​dǎo​céng shàng​rèn hòu, lì​jí duì tān​fǔ guān​yuán jìn​xíng le dà​guī​mó qīng​xǐ.

   After taking office, the new leadership immediately carried out a large-scale purge of corrupt officials.

   Source: Dong Chinese Dictionary

4. 我的上任留下了很多有用的资料。

   wǒ de shàng​rèn liú​xià le hěn​duō yǒu​yòng de zī​liào.

   My predecessor left behind a lot of useful information.

   Source: Dong Chinese Dictionary