Complex sentence: Globoidnan A is a lignan found in "Eucalyptus globoidea", a tree native to Australia, that has been found to inhibit the action of HIV integrase, an enzyme which is responsible for the introduction of HIV viral RNA into a host's cellular DNA.
Split into simpler sentences: Globoidnan A is a lignan found in "Eucalyptus globoidea", a tree native to Australia. The molecule has been found to inhibit the action of HIV integrase, an enzyme which is responsible for the introduction of HIV viral RNA into a host's cellular DNA.