2 sentences

1. 他在官场混迹多年，深谙处世之道。

   tā zài guān​chǎng hùn​jì duō nián, shēn'ān chǔ​shì zhī dào.

   He has been in officialdom for many years and knows the ways of the world very well.

   Source: Dong Chinese Dictionary

2. 他在官场几十年，始终坚持律己以廉。

   tā zài guān​chǎng jǐ​shí nián, shǐ​zhōng jiān​chí lǜ​jǐ yǐ lián.

   In his decades in officialdom, he has always maintained self-discipline and integrity.

   Source: Dong Chinese Dictionary