2 sentences

1. 他反应有些笨拙，经常跟不上大家的思路。

   tā fǎn​yìng yǒu​xiē bèn​zhuō, jīng​cháng gēn bù shàng dà​jiā de sī​lù.

   He is a bit slow-witted and often fails to keep up with everyone's thoughts.

   Source: Dong Chinese Dictionary

2. 他那双笨拙的大手很难处理这么精细的零件。

   tā nà shuāng bèn​zhuō de dà shǒu hěn nán chǔ​lǐ zhè​me jīng​xì de líng​jiàn.

   His clumsy hands have trouble handling such delicate parts.

   Source: Dong Chinese Dictionary