Complex sentence: After the war, many Japanese authors were emotionally and psychologically affected, and the aftereffects began to show in narratives, poems and essays related to death, disease, despair and defeat.
Split into simpler sentences: After the war, many Japanese authors were emotionally and psychologically affected and the aftereffects began to show in numerous Japanese literatures. Story plot, poem topics and essay ideas were all related to death, disease, despair and defeat.