Turn a CSV into something useful

Here are the first lines of a CSV:

{{header}}

I want: {{want}}

Start by telling me what each column appears to be and which ones you are unsure
about. Then give the transformation — SQL, a script, or spreadsheet formulas,
whichever is shortest for this job.

Flag anything in the sample that suggests the file is messier than it looks.

What to fill in

{{header}}

Header row and two examples — e.g. Paste three lines

{{want}}

What you want out — e.g. one row per user with their plan and last activity