3 sentences

1. 他一生都在探寻人生的真谛。

   tā yī​shēng dōu zài tàn​xún rén​shēng de zhēn​dì.

   He spent his entire life searching for the true meaning of life.

   Source: Dong Chinese Dictionary

2. 他通过多年的修行，终于领悟了人生的真谛。

   tā tōng​guò duō​nián de xiū​xíng, zhōng​yú lǐng​wù le rén​shēng de zhēn​dì.

   Through years of practice, he finally understood the true meaning of life.

   Source: Dong Chinese Dictionary

3. 经过多年的磨练，他终于领略到了这门艺术的真谛。

   jīng​guò duō nián de mó​liàn, tā zhōng​yú lǐng​lüè dào le zhè mén yì​shù de zhēn​dì.

   After years of practice, he finally understood the true essence of this art.

   Source: Dong Chinese Dictionary