she was put under house arrest two years ago but remained a powerful symbol in last year's election.
she 主语 was 谓语动词 under house arrest 表语 意为软禁 two years ago 时间状语 but是连词 remained 是谓语动词 a powerful symbol是表语 in last year's election 地点状语
整个句子意为 他两年前被软禁,但是这件事却在去年的大选中成为了他有影响力的符号
在这里arrest是名词,和house组成名词短语,house arrest意为软禁,因此用原型,was put是谓语,put under是使处于的意思,这里was put under是被动词的过去式