2.语句骨干为what motivated him was his zeal for “fundamental fairness”，其间what引导主语从句作语句的主语，we were to understand是刺进语，破折号后边protecting the taxpayer … their benefits为三个并排的动名词短语作同位语，进一步说明阐明“fundamental fairness”的具体内容；同位语中包括一个that引导的宾语从句，做ensuring的宾语，从句中claimant意为“请求人”。