Complex sentence: The report continued by asserting that confinement that participants experience, combined with forms of physical maltreatment, intensive ideological study, and forced confessions, are considered by social scientists a "brainwashing" program.
Split into simpler sentences: The report continued by claiming that confinement that participants experience, combined with forms of physical maltreatment, intensive ideological study, and forced confessions. Finally, the report claims that this treatment was considered by social scientists a "brainwashing" program.