Complex sentence: In Volume 4, he receives a new set of armor, and Crocea Mors is upgraded; it's indicated that the sword and shield's new accents come from Pyrrha's old armor.
Split into simpler sentences: In Volume 4, he receives a new set of armor, and Crocea Mors is upgraded. It's indicated that the sword and shield's new accents come from Pyrrha's old armor.