Original sentence: Among other descendants of George III  suffering from porphyria were his great-great-great-granddaughter Princess Charlotte of Prussia and her daughter Princess Feodora of Saxe-Meiningen
Edited sentence: Among other descendants of George III  theorised by the authors of Purple Secret to suffering from porphyria (based upon analysis of their extensive and detailed medical correspondence) were his great-great-granddaughter Princess Charlotte of Prussia (Kaiser Wilhelm II's eldest sister) and her daughter Princess Feodora of Saxe-Meiningen.They had more success in being able to uncover reliable evidence that George III's great-great-great-grandson Prince William of Gloucester was reliably diagnosed with variegate porphyria