2 sentences

1. 由于过度紧张，他的呼吸变得十分急促。

   yóu​yú guò​dù jǐn​zhāng, tā de hū​xī biàn de shí​fēn jí​cù.

   Due to extreme nervousness, his breathing became very rapid.

   Source: Dong Chinese Dictionary

2. 由于过度紧张，这位选手在决赛中发挥失常。

   yóu​yú guò​dù jǐn​zhāng, zhè wèi xuǎn​shǒu zài jué​sài zhōng fā​huī shī​cháng.

   Due to excessive nervousness, the contestant underperformed in the finals.

   Source: Dong Chinese Dictionary