A relative clause can be introduced by either a relative pronoun or a relative adverb. A relative clause can be restrictive or nonrestrictive (essential or nonessential) Restrictive relative clauses ...
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Even more pragmatic uses of inversion
WE have already taken up how inverted sentences depart from the normal sentence-verb-complement pattern (S-V/C) to put the ...
In this case, ‘Not until I saw what happened’ is the adverbial clause. The inversion takes place after this, in the main clause. This happens with 'Not +time' and 'Only + time'. 'Not since ...