The phrase "as being formerly" is correct and usable in written English.
It can be used to indicate a previous state or condition of something or someone.
Example: "The building is recognized as being formerly a textile factory before its renovation into apartments."
Alternatives: "previously known as" or "formerly referred to as".
Titian adopted the same arrangement in his portrait of a gentleman in blue (c. 1512), where the initials TV (Tiziano Vecellio) establish him as the painter rather than Giorgione, as was formerly believed.
In accordance with the "One Fungus = One Name" proposal (59), the newly discovered sexual state (teleomorph) of A. lentulus will not be assigned a separate Latin name, as was formerly the case under "dual nomenclature" (60).
Apocalyptic trends, given considerable impetus by the victory of the Maccabees over the Syrian Greeks, were not (as was formerly thought) restricted to Pharisaic circles.
It is now held that Hinduism was taken to Indonesia not by traders, as was formerly thought, but by Brahmans from India who taught Shaivism and the message of personal immortality.
A bicollateral bundle is the typical type for the family Convolvulaceae as was formerly reported by Metcalfe and Chalk (1950) and Tayade and Patil (2012a).
Chromatographic comparison studies lead to the conclusion that the currently studied antibodies also produce monocyclic products from the two substrates as has been formerly observed with a squalene-derived substrate.
Differences in molecular weight mass may be due to posttranslational modifications, residual protease activity, or association with other molecules as has been formerly reported.
On the other hand, supposed differences between Alexandrian and Palestinian Judaism are not as great as had been formerly thought.
The cellblock that includes Room 7021 is known as the Hospital, as it was formerly the infirmary.
He drank here, overlooking the river Thames in the Prospect of Whitby, or "Devil's Tavern" as it was formerly known, as commemorated by a noose hanging from a window.
