In plain terms when you brake and downshift to enter a turn, with a normal clutch, if you downshift too much, when you release the clutch the rear wheel will chatter or hop off the ground. Which makes entering the turn a pain in the ass.
With the slipper clutch it will not cause the chatter or hop so the entry into the turn will be smooth, I wish they had that when I raced
I high sided once in a race in Jamaica on a Honda F2 600 from to much chatter.