相当于which has been made available,作定语修饰evidence。若将此句还原,就是the evidence has been made available in 1998;或research has made the evidence available。available作主语补足语。意为:可以获取的。本回答被提问者和网友采纳
第2个回答 2015-08-12
made available是DNA evidence的状语,DNA evidence作by的宾语。可以将「DNA evidence made available」改写为一个定语从句「DNA evidence which was made available in 1998」.