Complex sentence: CGC's primary service is to provide a reliable, consistent, and non-partial comic books grading and authentication, which can greatly mitigate all these challenges and pitfalls that inherent with comic book collecting.
Split into simpler sentences: CGC's primary service is to provide a reliable, consistent, and non-partial comic books grading and authentication. Which can greatly mitigate all these challenges and pitfalls that inherent with comic book collecting.