Jackson has a pcd (primary cilia dyskinesia) where his cilia have defects that affect their motility. how is this related to jackson's respiratory symptoms?

The PCD is an abbreviation used for the primary cilia diskinesia disease. This condition result in the reduced motility of the cilia.  

In respiratory tract, the cilia help the mucus to flow above the respiratory tract. In case, the cilia is damaged, or it is not able to move, then the mucus cannot move out of the respiratory tract  and cause many respiratory abnormalities, such as congestion, infection, bronchitis, cough, short of breath, ear infections etc.  

voluntary muscles are controlled by the cerebellum.