Complex sentence: From there, the shopper will then submit the data collected to the mystery shopping company, which reviews and analyzes the information, completing quantitative or qualitative statistical (analysis) reports on the data for the client company.
Split into simpler sentences: From there, the shopper will then submit the data collected to the Mystery shopping company in question. That company then reviews and analyzes this information, completing quantitative or qualitative statistical (analysis) reports on the data for the client company.