And after her mother's death, it was her father who looked after her and her younger sister, and had seen them through school, and then ( had seen them through省略) college for her (mother省略).
备注(1) :It was ...who为强调句型，强调句子主语(her father)。
备注(2):蓝色字体为省略部分，即省略前面出现过的内容。
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个人理解，仅供参考。