1 sentence

1. 他在努力工作，与此同时，他还在自学英语。

   tā zài nǔ​lì gōng​zuò, yǔ​cǐ​tóng​shí, tā hái zài zì​xué Yīng​yǔ.

   He is working hard; meanwhile, he is also teaching himself English.

   Source: Dong Chinese Dictionary