Your xpath should look like that:
//*[contains(@class, 'criteria-label') or contains(@class ,'criteria-value')]
To experiment, learn and validate xpath I can recommend xpather and this cheatsheet.
Edit
To join both texts you can use string-join()
:
string-join((//span[@class='criteria-label']/text(),//p[@class ,'criteria-value']/text()),'')
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