2 sentences

1. 政府决定在五十年后将这些绝密档案解密。

   zhèng​fǔ jué​dìng zài wǔ​shí nián hòu jiāng zhè​xiē jué​mì dàng'àn jiě​mì.

   The government decided to declassify these top-secret files after fifty years.

   Source: Dong Chinese Dictionary

2. 由于忘记了密码，他无法解密这个重要的文件。

   yóu​yú wàng​jì le mì​mǎ, tā wú​fǎ jiě​mì zhè​ge zhòng​yào de wén​jiàn.

   Because he forgot the password, he could not decrypt this important file.

   Source: Dong Chinese Dictionary