Complex sentence: Realizing that he no longer resembled Sonic, Scourge could no longer fool people so easily, thus he no longer bothered trying to, taking his new name to distinguish himself from his counterpart.
Split into simpler sentences: Realizing that he no longer resembled Sonic, Evil Sonic could no longer fool people so easily. He no longer bothered trying afterwards, taking his new name, Scourge, to distinguish himself from his counterpart.