Complex sentence: BanchoLeomon is a master that serves only his own "justice" and if anything becomes an obstacle to that "justice", even if it's someone like the Royal Knights, or the Olympus Twelve, he will see them as enemies.
Split into simpler sentences: Bancholeomon is a master that serves only his own "justice", and, if anything, becomes an obstacle to that "justice". Even if it's someone like the Royal Knights or the Olympus Twelve, he will see them as enemies.