Grammaticality – Verb But No Subject After ‘Such As’?

O'Sullivan & Hilliard's The Law of Contract (2018 8 ed). p. 55.

3.23. The Ontario Court of Appeal suggested in Tilden Rent-A-Car Co v Clendenning (1978)
that the rule was too absolute, and chose to distinguish L’Estrange. There, the defendant
rented a car and signed the contract without reading it. On the back of the contract, in
fine and faint print, was a clause seeking to limit the claimant’s liability. The court, applying
orthodox offer and acceptance principles, held that a signature will only indicate
acceptance of a term where it is reasonable for the other party to believe that the offeree
really did agree to the term in question. While a court should be reluctant to find that a
signature did not indicate acceptance of a particular term (otherwise commercial uncertainty
would result), on the facts the term had not been accepted:

In ordinary commercial practice where there is frequently a sense of formality in the
transaction, and where there is a full opportunity for the parties to consider the terms of
the proposed contract submitted for signature, it might well be safe to assume that the
party who attaches his signature to the contract intends by so doing to acknowledge his
acquiescence to its terms, and that the other party entered into the contract upon that
belief. This can hardly be said, however, where the contract is entered into in circumstances
such as were present in this case.

What are some formal terms describing this syntax? How can a verb follow such as without another subject?