After ----- seemed a long time ,she came back.为什么不把after 当连词

After 【what】 seemed a long time ,she came back.
在似乎是很长一段时间之后,她回来了.
after介词,后面接宾语从句.
习惯搭配：
after it/that
it seems/seemed a long time
after what seems/seemed a long time
祝你开心如意!