Complex sentence: DuckDuckGo is built primarily upon search APIs from various major vendors (such as Yahoo! Search BOSS), because of this, TechCrunch characterized the service as a "hybrid" search engine.
Split into simpler sentences: DuckDuckGo is built primarily upon search APIs from various major vendors (such as Yahoo! Search BOSS). Because of this, TechCrunch characterized the service as a "hybrid" search engine.