Complex sentence: Finally in 1988, a new type of DNA testing, known as the PCR technique that worked on degraded samples (taken from Webb in 1977) proved that no contact between the two had taken place.
Split into simpler sentences: Finally in 1988, a new type of DNA testing, known as the PCR technique, became available. This form of testing was accurate on degraded samples (taken from Webb in 1977) and proved that no contact between the two had taken place.