2 sentences

1. 他决定退居二线，把机会留给年轻人。

   tā jué​dìng tuì​jū èr​xiàn, bǎ jī​huì liú​gěi nián​qīng​rén.

   He decided to step back and leave the opportunities to the younger generation.

   Source: Dong Chinese Dictionary

2. 他在晚年决定禅位于皇太子，自己退居二线。

   tā zài wǎn​nián jué​dìng shàn​wèi yú huáng​tài​zǐ, zì​jǐ tuì​jū èr​xiàn.

   In his later years, he decided to abdicate the throne to the crown prince and retire from active duty.

   Source: Dong Chinese Dictionary