Answer:
The Council of Trent was basically a counter-reform to bring members back. They saw that many were leaving because new ideas, such as Luther's, were spreading and they went against the Catholic Church. The Council of Trent pretty much made it look like the Catholic Church was going to change, but never really did. The rules were just worded differently.
An example would be a nasty roach-infested Pizza Hut with a mean employee and gross quality food. Nobody goes anymore because it's bad. So, they close down for remodeling. When they open up, everyone comes back because it looks better. In reality, they didn't fire the lady and the food is still bad.
Hope this helps.