Complex sentence: Fiorentini summons the help of Momo (Muller), a former intelligence colleague living in Tokyo, who helps Fiorentini in guarding Yumi from the Yakuza and investigating deeper into Miko's death.
Split into simpler sentences: Fiorentini summons the help of Momo (Muller), a former intelligence colleague living in Tokyo. He helps Fiorentini in guarding Yumi from the Yakuza and investigating deeper into Miko's death.