maduraban
-they were maturing
The word maduraban is the imperfect form of madurar in the third person plural.
See the full madurar conjugation

madurar

Pero en la ciudad maduraban los nuevos acontecimientos.
But in a city became ripe new events.
De ese modo, maduraban una sensibilidad humana y religiosa finísima, por la que la gente las veneraba.
In this way they developed a highly refined human and religious sensitivity which earned them the veneration of the people.
Maduraban a los 5 centímetros.
They were maturing at five centimeters.
Nos hemos quejado durante mucho tiempo, mientras maduraban, en cambio, las semillas de lo que habíamos puesto con gran sacrificio en las raíces de Europa.
We cried on each other' s shoulders for such a long time, but during this time the seeds of what we had sown with such sacrifice in the early days of Europe were preparing to bear fruit.
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