"hence was" is a correct and usable phrase in written English.
It is a formal and slightly archaic way of saying "as a result [of this]," and it typically introduces a clause that explains or adds information about the previous statement or situation. You can use it whenever you want to connect a cause and effect relationship between two events or ideas. Example: "The weather was extremely hot and humid; hence, everyone sought refuge in the cool shade of the trees."
Hence was born the very system Mr. Bloomberg decries.
Hence was born "Mrs. Three-in-One," who did everything: cook, waitress, hostess (though she had a kitchen helper).
I became so immersed in her article about diversity, that I lost track of time and, hence, was late.
In 1967, when Gov. George Romney of Michigan evinced interest in the Republican presidential nomination, his Mormonism was of little interest and hence was no impediment.
In contrast Verstappen was adjudged to have maintained his place ahead of Vettel only by cutting the corner and hence was punished.
"I looked for a system that had a similar flow regime and hence was naturally stable," he said.
He pointed out that the Vienna Circle's key article of faith, the principle of verification, according to which all propositions were meaningless unless they could be verified, could not itself be verified and hence was meaningless.
Frank W. Barrie, an administrative law judge, ruled that the leasing of a car to an independent cabdriver amounted to a rental and hence was subject to 13.25 percent in taxes.
Another argument against extradition, offered by the observers the West German government sent to Jerusalem, was that Germany had abolished capital punishment and hence was unable to mete out the sentence Eichmann deserved.
Copland had been trying to break into film work since 1937 but was still known in Hollywood as a composer of modernist art music and hence was considered too difficult for American moviegoers.
Anguilla was too rocky & dry for the great mechanized plantations the sugar industry required, & hence was exempted from the full force of the social transformation whereby communities of white planter-proprietors gave way to feudal estates supporting vast slave populations.
