2 sentences

1. 完成这份遗愿是他未了的心愿。

   wán​chéng zhè fèn yí​yuàn shì tā wèi​liǎo de xīn​yuàn.

   Fulfilling this final wish was his unfulfilled desire.

   Source: Dong Chinese Dictionary

2. 由于时间紧迫，他留下了一些未了的事务。

   yóu​yú shí​jiān jǐn​pò, tā liú​xià le yī​xiē wèi​liǎo de shì​wù.

   Due to time constraints, he left behind some unfinished business.

   Source: Dong Chinese Dictionary