3 sentences

1. 他是一名训练有素的运动员。

   tā shì yī míng xùn​liàn​yǒu​sù de yùn​dòng​yuán.

   He is a well-trained athlete.

   Source: Dong Chinese Dictionary

2. 这支队伍训练有素，非常有战斗力。

   zhè zhī duì​wǔ xùn​liàn​yǒu​sù, fēi​cháng yǒu zhàn​dòu​lì.

   This team is well-trained and has great combat effectiveness.

   Source: Dong Chinese Dictionary

3. 他虽然是一名农民，但也是一名训练有素的民兵。

   tā suī​rán shì yī míng nóng​mín, dàn yě shì yī míng xùn​liàn​yǒu​sù de mín​bīng.

   Although he is a farmer, he is also a well-trained militiaman.

   Source: Dong Chinese Dictionary