Complex sentence: As the war progressed into the late 1960s, public sentiment against the Chemical Corps increased because of the Army's continued use of herbicides, criticized in the press as being against the Geneva Protocol, napalm, and riot control agents.
Split into simpler sentences: As the war progressed into the late 1960s public sentiment against the Chemical Corps increased. The sentiment was the result of the Army's continued use of herbicides, criticized in the press as being against the Geneva Protocol, napalm, and riot control agents.