This is the 10375th most frequent Russian word.
важными
"Important" or "significant" (plural form).
The word 'важными' is used as an instrumental plural form of the adjective 'важный' and refers to the documents being important with respect to the project.
Эти документы являются важными для проекта.
These documents are important for the project.
Here, 'важными' is the instrumental plural form of the adjective 'важный', used to describe the shift in significance of the issues.
Мы обсуждали вопросы, которые стали важными в последнее время.
We discussed issues that have become important recently.
In this example, 'важными' appears as an instrumental plural to connect the predicate with its adjective modifier, emphasizing the importance of the changes.