Complex sentence: From blood samples, 16S rRNA was amplified using standard polymerase chain reaction (PCR), which was then analyzed using gel electrophoresis and a GAP (Genetic Analysis Program) system.
Split into simpler sentences: From blood samples, 16S rRNA was amplified using standard polymerase chain reaction (PCR). This PCR product was then analyzed using gel electrophoresis and a GAP (Genetic Analysis Program) system.