Complex sentence: Two months after the Kromaggs arrived, Quinn learned that he is not from Earth Prime, but of Kromagg Prime instead, though Quinn did live on Earth Prime from a time when he was a baby until when he started sliding.
Split into simpler sentences: Two months after the Kromaggs arrived, Quinn learned that he is not from Earth Prime, but of Kromagg Prime instead. Though Quinn did live on Earth Prime from a time when he was a baby until when he started sliding.