Complex sentence: In the novel, it is revealed that Peeta has been'hijacked' (a form of brainwashing using Tracker Jacker venom) to hate Katniss and even tries to choke her to death upon their reunion.
Split into simpler sentences: In the novel, it is revealed that Peeta has been'hijacked' (a form of brainwashing using Tracker Jacker venom) to hate Katniss. He tries to choke her to death upon their reunion.