Complex sentence: On the advice of their lawyer Cortés and Hastie decided to move forward with the book without consent from the people they were depicting; in the end only four people were asked for consent to use their likeness.
Split into simpler sentences: On the advice of their lawyer Cortés and Hastie decided to move forward with the book without consent from the people they were depicting. Only four people depicted in the book were asked for consent to use their likeness.