Using your scissors, run underneath any hair, carpet, or other threads that may have wrapped around the roller

An easy way is to follow the lines between any of the brushes (you do not want to cut theses) - and slice through anything that shouldn't be there.

Once everything has been freed up, you can tease everything out by hand in clumps. Here I've just gone along the brushes and pulled out anything that should not be there.

There we go - that looks a bit better!