Complex sentence: Grutas then proceeds to molest Lady Murasaki in front of Lecter, who then takes out the tantō from his back-sheath, which had blocked the bullet, and slashes Grutas's Achilles tendons with it, crippling him.
Split into simpler sentences: Grutas then proceeds to molest Lady Murasaki in front of him. Lecter then takes out the tantō from his back-sheath, which had blocked the bullet, and slashes Grutas' Achilles tendons with it, crippling him.