Complex sentence: As Robotnik begins to repair the damaged station, he meets Knuckles the Echidna, the last surviving member of an ancient echidna civilization that once inhabited the island, as well as the guardian of the Master Emerald, which grants the island its levitation powers.
Split into simpler sentences: As Robotnik begins to repair the damaged station, he meets Knuckles the Echidna. Knuckles is the last surviving member of an ancient echidna civilization that once inhabited the island, as well as the guardian of the Master Emerald, which grants the island its levitation powers.