The phrase 'henceforth became' is correct and can be used in written English.
It is used to indicate that something happened in the past and has now been established or continued. Example: The river henceforth became known as the River of Life.
The history of the largest district, Diyār Rabīʿah in eastern Al-Jazīrah, henceforth became identical with that of its capital, Mosul.
Ideas about the proper relationships between members of society were naturally questioned when the old feudal order was shaken, and in that period the great teacher Confucius elaborated the social concepts that henceforth became normative for Chinese civilization.
Fortunately for him he came across a vegetarian restaurant as well as a book providing a reasoned defense of vegetarianism, which henceforth became a matter of conviction for him, not merely a legacy of his Vaishnava background.
Plans for an invasion were definitively discarded; the campaign against Britain henceforth became purely a blockade of its sea approaches, conducted mainly by submarines and only supplemented by the Luftwaffe.
Much like Qin itself (for which see Pines 2014a), Legalism henceforth became a negative label, associated with the policies immensely opposed by the majority of imperial literati: excessive harshness, oppression, terror at court, imperial hubris, and the like.
Throckmorton henceforth became his political advisor and intimate.
They announced that shaved heads would henceforth become a summer ritual.
Announcing half-yearly results on October 2nd, he also said that Vivendi, which is in the middle of a high-risk $34 billion merger with Canada's Seagram, will henceforth become a model of good corporate governance, thanks to a series of measures designed to make shareholder votes fairer and to sweep away anachronistic restrictions on outsiders.
Through d'Alembert, Condorcet was granted an introduction to Voltaire, who would henceforth become another great influence on the young man; and he began attending the salon of Julie Jeanne Julie Éléonoree) de Lespinasse, a gathering place for the leading philosophes of the day.
The commercial manufacture of hard rubber products started during the mid-19th century and henceforth ebonite became an important branch of the rubber industry.
Henceforth, that became his official name.
