2 sentences

1. 他因严重罪行被判处无期徒刑。

   tā yīn yán​zhòng zuì​xíng bèi pàn​chǔ wú​qī​tú​xíng.

   He was sentenced to life imprisonment for a serious crime.

   Source: Dong Chinese Dictionary

2. 他因为犯下杀人罪被判处无期徒刑。

   tā yīn​wèi fàn​xià shā​rén zuì bèi pàn​chǔ wú​qī​tú​xíng.

   He was sentenced to life imprisonment for committing murder.

   Source: Dong Chinese Dictionary