他小题大作。

He makes a mountain out of a molehill.

He makes mountains out of molehills.

Source: Tatoeba

Sentence Composition

1 他 tā
  1. (third-person singular) (since the early 20th century, usu. male) he; him; his
  2. (bound form) other; another; some other (as in 他日 tārì and 他人 tārén)
2 小题大作 xiǎotídàzuò variant of 小題大做 xiǎotídàzuò