Complex sentence: Even though E- 102 Γ is a robot, he has a personality, though given his mindless actions as Eggman's slave, it is unknown if he gained sentience, or simply disregarded it at first.
Split into simpler sentences: Even though E- 102 Γ is a robot, he does have a personality. Howver, given his mindless actions as Eggman's slave, it is unknown if he gained sentience or had it all along but simply disregarded it at first.