See grapheneos.org/history/copperheados and verify it for yourself using Github graphs and other resources.
A better description would be "One person handled development of the project and other person CEO'd the sponsor company. The CEO attempted to hijack the project and the developer eventually resumed the project under the name GrapheneOS."
"Two People created CopperheadOS, they had a disagreement. One of them continues to work on it under the name GrapheneOS."
Would this describe it better?