3 sentences

1. 旬月之间，工程便已宣告竣工。

   xún yuè zhī​jiān, gōng​chéng biàn yǐ xuān​gào jùn​gōng.

   Within a month or so, the project was declared complete.

   Source: Dong Chinese Dictionary

2. 她七个月前就已经被宣告死亡了。

   tā qī gè yuè qián jiù yǐ​jīng bèi xuān​gào sǐ​wáng le.

   She was declared dead seven months ago.

   Source: OpenSubtitles

3. 两国正式宣告停战，结束了长年的冲突。

   liǎng guó zhèng​shì xuān​gào tíng​zhàn, jié​shù le cháng​nián de chōng​tū.

   The two countries officially declared an armistice, ending years of conflict.

   Source: Dong Chinese Dictionary