Complex sentence: Since there are no existing claims or copyright claims, all Supreme Publications are at this time public domain and many of his books are in digital storage form (CD's and DVD's) that can be purchased on-line or downloaded free.
Split into simpler sentences: Since there are no existing claims or copyright claims, all Supreme Publications are at this time public domain. Many of his books are in digital storage form (CD's and DVD's) that can be purchased on-line or downloaded free.