If I say, "Yesterday I waited for you at your house till midnight until after then you get in.
What does the phrase "until after then" mean in this sentence?
I can somehow understand it like this : "Yesterday I waited for you at your house till midnight but you didn't arrived until then so I went back, and then you arrived".
(X) Yesterday I waited for you at your house till midnight until after then you get in-- this sentence means nothing, Gary. The sentence structure is impossible. To say what you want to say (Yesterday I waited for you at your house till midnight but you didn't arrived until then so I went back, and then you arrived) you will have to rearrange it this way: