4 sentences

1. 双方同意请第三方来调解这起纠纷。

   shuāng​fāng tóng​yì qǐng dì​sān fāng lái tiáo​jiě zhè qǐ jiū​fēn.

   Both parties agreed to invite a third party to mediate the dispute.

   Source: Dong Chinese Dictionary

2. 我们需要一个公正的第三方来调解纠纷。

   wǒ​men xū​yào yī gè gōng​zhèng de dì​sān​fāng lái tiáo​jiě jiū​fēn.

   We need an impartial third party to mediate the dispute.

   Source: Dong Chinese Dictionary

3. 由于双方僵持不下，只好请调解委员会出面。

   yóu​yú shuāng​fāng jiāng​chí​bù​xià, zhǐ​hǎo qǐng tiáo​jiě wěi​yuán​huì chū​miàn.

   Since both sides were at a stalemate, the mediation committee had to step in.

   Source: Dong Chinese Dictionary

4. 他在中间积极调解，最终赞成了这桩看似不可能的婚事。

   tā zài zhōng​jiān jī​jí tiáo​jiě, zuì​zhōng zàn​chéng le zhè zhuāng kàn​sì bù​kě​néng de hūn​shì.

   He mediated actively and eventually gave his blessing to this seemingly impossible marriage.

   Source: Dong Chinese Dictionary