Complex sentence: Leo runs into Max, who is suffering varying degrees of memory loss and attacks Leo, not recognizing him, but fellow agent Sasha Ivanoff and team leader Nikolai Bulygin arrive to help.
Split into simpler sentences: Leo runs into Max, who is suffering varying degrees of memory loss. He attacks Leo, not recognizing him, but fellow agent Sasha Ivanoff and team leader Nikolai Bulygin arrive to help.