Complex sentence: Amaterasu sent him to pacify Japan by bringing the three celestial gifts used by the emperor: the sword Kusanagi, the mirror Yata no kagami, and the jewel Yasakani no magatama.
Split into simpler sentences: Amaterasu sent him to pacify Japan by bringing the three celestial gifts used by the emperor. The sword Kusanagi, the mirror Yata no kagami, and the jewel Yasakani no magatama.