The phrase "initially existed" is correct and usable in written English.
It can be used to describe something that was present or came into being at the beginning of a certain time period or context.
Example: "The species initially existed in a much larger habitat before environmental changes occurred."
Alternatives: "originally existed" or "first appeared".
It had initially existed largely as a contractor for the US military, developing machines that can walk on rugged terrain.
Section 230 of the CDA, paradoxically, initially existed to encourage online platforms to be proactive about filtering, blocking and sanitizing content.
Waldron takes Locke to be making a descriptive statement, not a normative one, about the condition that happens to have initially existed.
The march of time, the overarching U.S.-Japan alliance and cultural understanding built up over the decades -- not to mention the camaraderie forged by doing groundbreaking science together -- has bridged whatever chasms initially existed.
The very act of forming a band could be seen as politically subversive in Communist Eastern Europe, and acts such as Omega, in Hungary, and Aquarium, in the Soviet Union, initially existed as underground groups.
Substantial differences initially existed between the lists of the central government and those in the local offices.
The mechanical response of engineering materials evaluated through continuum fracture mechanics typically assumes that a crack or void initially exists, but it does not provide information about the nucleation of such flaws in an otherwise flawless microstructure.
In general, the model predicts that solubilization is favoured when the B chains are small and the A chains are large and initially exist in a thin shell layer.
As discussed above, somatic mtDNA mutations will initially exist at very low heteroplasmy levels.
A somatic mutation will presumably initially exist as a unique species within a cell.
The HCCA would initially exist within the Ministry of Health, with plans to make it an independent entity in the future.
