to him与 than she was没有联系,to him是“对他来说”的意思,只与which seemed to be more important发生联系.
这句话句末省略了important.即:which seemed to be more important to him than she was important.
比较状语从句中常常这样省略.又如:
I'm taller than you are (tall).
甚至把are都省略,说成:
I'm taller than you.