The traditional presentation of the book generally distinguishes two major parts:
Daniel 1-6: the historical narratives;
Daniel 7-12: the prophetic visions.
This distinction remains useful for a first approach.
It does correspond to a change in the dominant literary character. The first chapters mainly recount events experienced by Daniel and his companions, whereas the last ones mainly report visions received by Daniel.
This division must not, however, become an absolute separation.
Daniel 2 already contains an important prophetic revelation concerning the succession of kingdoms.
Daniel 7, although belonging to the visions, remains linguistically and literarily attached to the Aramaic section of Daniel 2-7.
Narratives and prophecies are therefore closely interwoven.