How to Say "concurrent" in Spanish
The Spanish word for “concurrent” is “simultáneo” — B1 level.

Examples
Hubo tres incendios simultáneos en la ciudad.
There were three simultaneous fires in the city.
La traducción simultánea es un trabajo muy difícil.
Simultaneous translation is a very difficult job.
El servidor permite el acceso simultáneo de cien usuarios.
The server allows the simultaneous access of one hundred users.
Making it Match
This word must match the gender of the object you are describing. If you are talking about something feminine like 'acciones' (actions), you must change it to 'simultáneas'.
Where to Put It
In Spanish, this word almost always comes after the noun it describes, such as in 'eventos simultáneos' (simultaneous events).
Using the wrong ending
Mistake: “dos llamadas simultáneo”
Correction: dos llamadas simultáneas (because 'llamadas' is feminine and plural).
Confusing it with an action
Mistake: “Ellos hablaron simultáneo.”
Correction: Ellos hablaron simultáneamente (use the '-mente' version to describe HOW an action is done).
Related Translations
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