The phrase "exists simultaneously" is a correct and usable phrase in written English.
It can be used to describe when two or more things are occurring or existing at the same time. For example, "The two theories can exist simultaneously without contradicting each other."
All this is blended, in Robert Jones's design, with glimpses of medieval artworks to make the point that Shaw's play exists simultaneously in the past and present.
The clues are pointed, and it doesn't take long to figure out that the adult Diana's life exists simultaneously with her life as a teenager.
That is true of "Krankenhaus Blues," the bizarre tale of an actress, a playwright and a clown imprisoned in a Nazi camp that exists simultaneously in the World War II era and now.
The mind of these poems exists simultaneously in St. Lucia and in Sicily (after all, St. Lucy — the patron saint of light or vision — came from the Italian city of Syracuse); in a harbor that is at once Rodney Bay, Venice and Stockholm; under a mountain that is both the Petit Piton and the Matterhorn.
According to this theory, every possible outcome in the Universe exists simultaneously in other universes.
Besides, the dissolution-electrodeposition of PbO s) → [PbO·Cl·EG]− → Pb(s) exists simultaneously with the direct deoxidation of PbO s) → Pb(s) during the electrolysis process.
The bull-man existed simultaneously with more naturalistic imagery.
It's possible for everything to co-exist simultaneously.
Buildings exist simultaneously on the material and metaphoric plane.
Both styles existed simultaneously, but very few manuscripts written in square capitals survive from ancient times.
Two parallel worlds exist simultaneously within the city, each unaffected and unnoticed by the other.
