Complex sentence: He is scared by this prospect and flees, however the "Darkness" is following him and at the videos pinacle, the boy finally confronts it; grabbing an emergency axe, he attacks the "Darkness" and runs away.
Split into simpler sentences: He is scared by this prospect and flees, however the "Darkness" follows him. At the video's pinnacle, the boy finally confronts it: grabbing an emergency axe, he attacks the "Darkness" and runs away.