【and平行结构的见解，仅供参考】

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我个人对于and平行结构的见解，仅供参考，如果不对欢迎指正：

(1) 单词或者名词性短语之间的并列连接
二元形式：word1 and word2   （注意word可以替换成词组短语，下同）
三元形式：word1, word2, and word3   （注意这种形式的标点符号的位置）

(2)动宾短语之间的并列连接
somebody does A and does B.
somebody does A, does B, and does C.
somebody plans to do A, to do B, and to do C. （注意后两个to可以省略，即：somebody plans to do A, do B, and do C.)

(3)句子之间如果要用and连接，那么每个分句必须都有自己的主谓，而且每个分句都要用and连接，这个和单词词组不一样。
比如：sentence1(主+谓), and sentence2(主+谓), and sentence3(主+谓)
注：当然如果用分号或者句号连接每个句子更常见

(4)that从句之间如果用and连接，gmat里并列的that从句往往需要补出that。比如The president claims that ... and that ...

夜不懂辰明

请问：manhattan平行结构这章里
Voters want to elect a president who genuinely cares about health care, the environment, and the travails of ordinary men and women, and who has the experience, wisdom, and strength of character required for the job.
第二个who从句and前的逗号可以省略吗？
是因为避免与前面的并列产生歧义才加的逗号么？
谢谢！