Complex sentence: From his hospital bed he manages to bring down a cathedral on the "unworthy heads" of a VIP congregation giving thanks for the building's preservation; and he seems able to keep himself alive by sheer willpower.
Split into simpler sentences: From his hospital bed, he manages to bring down a cathedral on the "unworthy heads" of a VIP congregation giving thanks for the building's preservation. Morlar seems able to keep himself alive by sheer willpower.