This is the 15666th most frequent Russian word.
принесены
"Принесены" means "brought."
Here, 'принесены' is in the past tense passive voice, describing the action of 'bringing' as having been completed for the documents.
Документы были принесены секретарём.
The documents were brought by the secretary.
In this sentence, 'принесены' again serves as a past passive form, indicating that proposals were brought to a specific occasion.
На совещание были принесены важные предложения.
Important proposals were brought to the meeting.
This application of 'принесены' emphasizes the manner ('carefully') in which the flowers were brought as a completed action.