se debió

was due to

→ se
phrase Uncommon #22,311
was due to Usually followed by a or a noun phrase to explain the cause: se debió a la tormenta means “it was due to the storm.” In other contexts, deberse can mean “to be owed,” as in ¿Cuánto se debe? (“How much is owed?”).
SP: El retraso se debió a un problema técnico.
EN: The delay was due to a technical problem.

Su ausencia se debió a una enfermedad.

His absence was due to illness.

Mi éxito se debió a tu ayuda.

My success was due to your help.

Su ausencia se debió a la tormenta.

His absence was due to the storm.

El accidente se debió al manejo imprudente.

The accident was due to reckless driving.

Su ausencia de ayer se debió a un resfriado.

His absence yesterday was due to a cold.