Complex sentence: Hungry for revenge, both on Reika and Hiroko's trio (which is now called Rose Cross), Nami gains the trust of Hiroko, who allows her to join their trio, amused at how eager Nami is to join them after initially berating them.
Split into simpler sentences: Hungry for revenge, both on Reika and Hiroko's trio, now called Rose Cross, Nami gains the trust of Hiroko. Hiroko allows her to join their trio, amused at how eager Nami is to join them after initially berating them.