Complex sentence: He is not alone in this boss battle as he calls upon his subordinates to come from every direction, however can be easily separated out among the other swordsmen as he is the only one wearing a blue outfit.
Split into simpler sentences: He is not alone in this boss battle as he calls upon his subordinates to come at you from every direction. He can be easily separated out among the other swordsmen as he is the only one wearing a blue outfit.