No hay relación de anterioridad y posterioridad; los eventos sucedieron simultáneamente.There's no relation of anteriority and posteriority; the events took place simultaneously.
b.
This refers to an idiomatic word or phrase for which there is no word-for-word translation.
no direct translation
No te puedes meter en la piscina si no te duchaste con anterioridad.You cannot dive into the pool if you haven't showered beforehand.
Deberías de haber reservado un hotel con anterioridad a tu partida.You should have made a hotel reservation prior to your departure.