Complex sentence: Asakawa shows it to him, and although Ryūji remains cool and nonchalant he agrees there is a powerful aura around the tape, and asks Asakawa to make him a copy to study at home, which Asakawa does.
Split into simpler sentences: Asakawa shows it to him, and although Ryūji remains cool and nonchalant he agrees there is a powerful aura around the tape. He asks Asakawa to make him a copy to study at home, which Asakawa does.