habíamos sometido
-we had subdued
Past perfect nosotros conjugation of someter.

someter

Más tarde, pensándolo mejor, creo haber descubierto que Hannes y yo, cada uno por su camino, habíamos sometido el Caribe Colombiano al mismo régimen de trasposiciones poéticas.
Later on, giving it more thought, I felt I had discovered that Hannes and I, each in his own way, had submitted the Caribbean coast of Colombia to the same set of poetic transpositions.
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