make sense (out) of (something)
To interpret something in a way that one can understand or that reveals some purpose, reason, etc. It will be a long time before we can begin to make sense of this tragedy. Can you make sense out of these markings? Is it a code, or what?
make (some) sense (out) of someone or something
to understand someone or something. I can't make sense out of Doris and what she has done! No one can make sense out of Tom's story.