3 sentences

1. 你母亲太心软了。

   nǐ mǔ​qīn tài xīn​ruǎn le.

   Your mother is too softhearted.

   Source: OpenSubtitles

2. 面对他再三的恳求，她终于心软了。

   miàn​duì tā zài​sān de kěn​qiú, tā zhōng​yú xīn​ruǎn le.

   Faced with his repeated pleas, her heart finally softened.

   Source: Dong Chinese Dictionary

3. 看到孩子哭得那么伤心，他终究还是心软了。

   kàn​dào hái​zi kū de nà​me shāng​xīn, tā zhōng​jiū hái​shi xīn​ruǎn le.

   Seeing the child cry so bitterly, he eventually softened his heart.

   Source: Dong Chinese Dictionary