This form will help you with basic retrieval of raw statements, if you're looking for something easier to read, check out the xAPI Statement Viewer.
This tool helps generate valid statements and demonstrates various interactions with an LRS. xAPI Lab is free and open-source, check it out on github.
It is recommended that you use the xAPI Specification as a reference when using this tool.
View statements sent to the ADL LRS with xAPI Statement Viewer
xapi-lab git @ master