深呼吸，然後放鬆。

Take a deep breath and then relax.

Source: Tatoeba

Sentence Composition

1 深呼吸 shēnhūxī to take a deep breath; to breathe deeply
2 然後 ránhòu then; after that; afterwards
3 放鬆 fàngsōng to relax; to slacken; to loosen