@metcet - The first action is speaking to the manager. The second action is going.
He spoke to the manager and then he went. He completes the action of speaking, then goes.
He didn �t go until he had spoken to the manager.
He stayed until he had spoken to the manager.
@memthefirst - Because one action is completed before the other we need past perfect.
To use simple past there would have to be two statements connected by �and then � to show the time sequence. He spoke to the manager and then he went.
Some speakers may use the simple past as you suggested, but it isn �t grammatically correct IMHO.