3 sentences

1. 他待人向来蒙厚质朴，从不投机取巧。

   tā dài​rén xiàng​lái méng hòu zhì​pǔ, cóng bù tóu​jī​qǔ​qiǎo.

   He has always been honest and simple in his dealings with others, never resorting to trickery.

   Source: Dong Chinese Dictionary

2. 他质朴的笑容给人留下了深刻的印象。

   tā zhì​pǔ de xiào​róng gěi rén liú​xià le shēn​kè de yìn​xiàng.

   His simple smile left a deep impression on people.

   Source: Dong Chinese Dictionary

3. 他的写作风格简洁质朴。

   tā de xiě​zuò fēng​gé jiǎn​jié zhì​pǔ.

   His writing style is simple and unadorned.

   Source: Dong Chinese Dictionary