Complex sentence: Coming from a background as a lawyer and a judge he was asked to be a member of the second Audiencia after the first Audiencias failure, and he took a strong interest in restoring order to the Michoacán area which had been ravaged by rebellions and unrest.
Split into simpler sentences: Coming from a background as a lawyer and a judge he was appointed to be a judge in the second Audiencia after the first Audiencias failure. As an "oídor" he took a strong interest in restoring order to the Michoacán area which had been ravaged by rebellions and unrest.