Complex sentence: Sapovirus is a non-enveloped, positive-sense, single-stranded RNA virus about 7.7kb in size and contains a 3'-end poly (A) tail however it does not have a 5' cap.
Split into simpler sentences: Sapovirus is a non-enveloped, positive-sense, single-stranded RNA virus about 7.7kb in size. The virus has a 3'-end poly (A) tail but not a 5' cap.