3 sentences

1. 传说他得道成仙，已经脱胎换骨。

   chuán​shuō tā dé​dào chéng​xiān, yǐ​jīng tuō​tāi​huàn​gǔ.

   Legend has it that he attained immortality and underwent a complete transformation.

   Source: Dong Chinese Dictionary

2. 经过军营生活的洗礼，他整个人都脱胎换骨了。

   jīng​guò jūn​yíng shēng​huó de xǐ​lǐ, tā zhěng gè rén dōu tuō​tāi​huàn​gǔ le.

   After the experience of military life, he was completely transformed.

   Source: Dong Chinese Dictionary

3. 这部戏剧在传统故事的基础上脱胎换骨，赋予了现代意义。

   zhè bù xì​jù zài chuán​tǒng gù​shi de jī​chǔ shàng tuō​tāi​huàn​gǔ, fù​yǔ le xiàn​dài yì​yì.

   The play was transformed from the traditional story, giving it modern significance.

   Source: Dong Chinese Dictionary