Complex sentence: William Marling, for instance, suggested that Cain may have taken the title from the sensational 1927 case of Ruth Snyder, who, like Cora in "Postman", had conspired with her lover to murder her husband.
Split into simpler sentences: William Marling, for instance, suggested that Cain may have taken the title from the sensational 1927 case of Ruth Snyder. Snyder was a woman who, like Cora in "Postman", had conspired with her lover to murder her husband.