Complex sentence: His key episode in this series is The Eliminator in which he receives an upgrade via the Eliminator chip which makes him stronger, faster and smarter--and puts him in Cobra Commander's good graces.
Split into simpler sentences: His key episode in this series is The Eliminator in which he receives an upgrade via the Eliminator chip which makes him stronger, faster and smarter. This puts him in Cobra Commander's good graces.