This is not writing all the code for you, but this should hopefully help. Your error seems to be in how to access the information in the structured variable. I am assuming you've saved data to the workspace from a Simulink scope as a structured variable. The first thing you'll want to do is double click on the structured variable in the workspace to open it up in the variable editor and view the path names of interest (if you don't know them already). Just keep clicking through the structures in the variable editor until you get a list of your time points, or output points. Then just reference those paths in a plot command.
Structured elements use a . to denote moving down a structure level so for exmaple:
As shown in the link Albert provided, there are ways to build more advanced subplots than I have shown, but it's a start.