Complex sentence: If what Joseph Atwill is saying is only partially true, we are looking into the abyss, but Eisenman notably stopping short of claiming that Atwill's work was indeed even partially true.
Split into simpler sentences: If what Joseph Atwill is saying is only partially true, we are looking into the abyss. However, Eisenman notably stopping short of claiming that Atwill's work was indeed even partially true.