question on strange structure of sentence

[zhengrong]

In my brain there are two sentences I never met before I read them

1) Under no circumstance will we excavate any successfully recommended talents from our clients

2) No sooner do you buy a computer than they bring out a new one that supersede it.

I said I never met them, which meams I feel these sentences are so strange that put auxiliary verb in front of subject but still is a declarative sentence, whereas in my mind, any auxiliary verb was put in front of subject, means this sentence will be an interrogative sentence. So even without new word to me, I still couldn't make clear what does these two sentences mean. I have to beg your help.
Please help to explain accurate what does these two sentence mean, if it is possible, rephrase by another way, and please parsing structure of these two sentences.

I 'll be grateful for your reply.

[gaoshinde]

the first sentence should have the meaning that
1. under no circumatances we will excavate any successfully recommended talents from our clients.
in it just to emphasise, situation the auxillary has been put bfore the subject.
2. in the second sentence the work / the sequnce has been highlighted

[David L.]

1) Under no circumstance will we excavate any successfully recommended talents from our clients

I have no idea what that sentence means. Compare this sentence, which is grammatically correct:
Under no circumstance will we excavate any building site until we have received offioial permission from the City Council for the work to commence.
Do you have any question about the structure of that sentence?


No sooner do you buy a computer than they bring out a new one that supersede it.
No sooner do you buy a computer than they bring out a new one that supersedes it.

[zhengrong]

The first sentance I took from here:
Principle

[David L.]

That makes it clearer.
This is a Hong Kong-based company, and the passage suffers the fate of English being written by a non-native speaker.
The company does the advertising and interviewing of top-notch people sought by some employer. In effect, what it means is, that in seeking out these people for a client, the company won't think, boy, they are good! Never mind the client, we'll grab them and employ them ourselves in our company!
I've been able to fathom that knowing what the company does, but the sentence is still virtually nonsense.