one question of technical english

liangduoqian

He retired four months ago, after the institute agreeed to funnel what would have been his salary back into his lab to pay for staff and supplies.

这是美国人写教科书原文。我想问，对于 retire和agree， 哪个动作在前，依据是什么？谢谢

能改成He retired four months after the institute agreeed to funnel what would have been his salary back into his lab to pay for staff and supplies.么？这样意思很明了了。难道作者要表示的两层意思。agree后四个月就tire，tire四个月后该文出版。如果是那样，不得不佩服作者的简洁了。