请帮我分析一下下面这句话的语法结构,这是现代大学英语第三册第一课里面的一句话.
问题描述：
请帮我分析一下下面这句话的语法结构,这是现代大学英语第三册第一课里面的一句话.
During the course I had come to realize that while my world was expanding and new options were opening for me,my father,who was in his sixties,was seeing his world shrink and his options narrow.
was seeing 后面的部分怎么理解，是宾语从句吗？
答
During the course 是时间状语,I had come to realize that ... 是主句部分,I 主语,had come to realize 谓语,that 引导宾语从句.现在分析 that 宾语从句内部的结构.while 连词,表示对比,while my world...