Complex sentence: There are various claims as to the identity of Hickok's fifth card, and there is also some reason to believe that he had discarded one card, the draw was interrupted by the shooting, and he never got the fifth card he was due.
Split into simpler sentences: There are various claims as to the identity of Hickok's fifth card and there is also some reason to believe that he had discarded one card. The draw was interrupted by the shooting and he never got the fifth card he was due.