Complex sentence: The 1993 prize credited Kary Mullis with the development of the polymerase chain reaction (PCR) method, a central technique in molecular biology which allowed for the amplification of specified DNA sequences.
Split into simpler sentences: The 1993 prize credited Kary Mullis with the development of the polymerase chain reaction (PCR) method. This is a central technique in molecular biology which allows for the amplification of specified DNA sequences.