Usage Note
Sumado is the past participle of sumar used as an adjective. The phrase sumado a functions as a prepositional connector meaning 'in addition to' or 'combined with', for example el cansancio, sumado al calor, hizo la marcha difícil. This use is common in formal and journalistic writing.
Examples
"La falta de fondos, sumada al retraso, complicó el proyecto."
Natural Translation
The lack of funds, combined with the delay, complicated the project.

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