as the odds of是一个从句结构;the odds of表示--几率,而as the odds of语义一定是--几率增大或变小;and all the attendant need for phsical and financial assistance并列结构【先不看】;as the odds of having a weak elderly parent have jumped eightfold in just one generation.在一代人的时间里,需要医疗照顾和财政救助的老年人口增加了八倍。
odd 此处指几率这里破折号之间的句子是插入语,不影响句意,主干是the odds of having a weak elderly parent have jumped eightfold in just generation (拥有一个年老体衰的家长的几率在一代人中翻了八倍),插入语修饰parent,指这些长辈需要经济上和身体上的帮助。望采纳