Complex sentence: Combining slides and posters, he arranged a chronological collection of works that spanned the millennia, from the neutral attitude in Biblical suicides through the portrayal of ambivalence and the cry for help indicative of modern times.
Split into simpler sentences: Combining slides and posters, he arranged a collection of works that spanned the millennia. He found a neutral attitude in Biblical suicides, followed by later ambivalence, and then the cry for help indicative of modern times.