Complex sentence: Leung describes the film as an objective examination of the idea that HIV causes AIDS, whereas the film's claims of impartiality have been widely rejected by scientists and dismissed as pseudo-science and conspiracy theory masquerading as even-handed examination.
Split into simpler sentences: Leung describes the film as an objective examination of the idea that HIV causes AIDS. The film's claims of impartiality have been widely rejected by scientists, who dismissed the film as pseudo-science and conspiracy theory masquerading as even-handed examination.