The book of Daniel cannot be explained by a single division.
The traditional division between narratives and visions is real, but it does not account for the linguistic distribution.
The division between Hebrew and Aramaic is important, but it is no more sufficient to explain the prophetic progression.
The concentric structure of Daniel 2-7 is particularly clear, but it must not be artificially extended to all twelve chapters.
We must therefore distinguish several levels:
the narrative and prophetic structure;
the linguistic structure;
the concentric structure of Daniel 2-7;
the historical chronology;
the progression of the revelations;
the general theological movement of the book.
These levels complement one another.