hubieron desarrollado
-they/you had developed
Preterite perfect ellos/ellas/ustedes conjugation of desarrollar.

desarrollar

Cuando sus planes se hubieron desarrollado hasta el punto de desilusionarlo, no hay duda de que había ido demasiado lejos como para que su orgullo original y dañino le permitiera detenerse.
By the time his plans had developed to the point of disillusionment, no doubt he had gone too far for his original and mischief-making pride to permit him to stop.
Word of the Day
Christmas