Complex sentence: She tries to force Fenix to murder Alma as well, but, after a struggle, he manages to plunge a knife into Concha's stomach, but she doesn't die and reveals to him that she will always be inside him, vanishing before his eyes.
Split into simpler sentences: She tries to force Fenix to murder Alma as well, but, after a struggle, he manages to plunge a knife into Concha's stomach. But she doesn't die, and reveals to him that she will always be inside him, vanishing before his eyes.