The phrase "through the extent" is correct and commonly used in written English.
It means throughout the extent or extent of something. Example: "Through the extent of their journey, they encountered many obstacles and challenges, but they never gave up."
Through the extent of his comments, Alderson's tone, over all, was optimistic.
And as the news of delays in Jonny Wilkinson's recovery from shoulder surgery starts to filter through, the extent of his self-sacrifice last year gradually becomes clearer.
We find that substantial change is associated with steep increases in human activity, which we infer primarily through the extent of road and dirt track development.
The underlying issue, manifested through the extent of Article 113 and implied powers, was the evolution of European integration and its impact on States' competence.
This growth differential in turn depends on the mobility of the technology's labor force, which we model through the extent that technologies depend upon immigrant scientists and engineers.
The tsunami run-up is estimated by conjecture through the extent of damage and its associated phenomena.
It's hardly rare for a child to want to follow in a parent's footsteps, but few carry through to the extent Aifantis has.
The defendant ensured each child's compliance and silence through grooming to the extent that he abused several of the victims many, many times.
"Perhaps it was the smell of his skin... the penetrating blue eyes, penetrating because they seemed to see right through me, to the extent that I could feel a blush rise up from some unchartered part of me..."...
"We will continue to make investments through Flatiron to the extent that the partners of Flatiron believe that the potential returns are justified by the risk," Murray said.
Overall policy effectiveness was reflected through this by the extent to which a policy works from all four aspects of the circular effectiveness cycle.
