3 sentences

1. 他因抢劫罪被判处监禁十年。

   tā yīn qiǎng​jié​zuì bèi pàn​chǔ jiān​jìn shí nián.

   He was sentenced to ten years' imprisonment for robbery.

   Source: Dong Chinese Dictionary

2. 他因犯下重罪被判处终身监禁。

   tā yīn fàn​xià zhòng​zuì bèi pàn​chǔ zhōng​shēn jiān​jìn.

   He was sentenced to life imprisonment for committing a felony.

   Source: Dong Chinese Dictionary

3. 他因为收受贿赂而被判处五年监禁。

   tā yīn​wèi shōu​shòu huì​lù ér bèi pàn​chǔ wǔ nián jiān​jìn.

   He was sentenced to five years in prison for taking bribes.

   Source: Dong Chinese Dictionary