Complex sentence: COX-3 is the third and most recently discovered cyclooxygenase COX isozyme, and is actively being studied for its similarities and differences between the COX-1 and COX-2 enzymes.
Split into simpler sentences: COX-3 is the third and most recently discovered cyclooxygenase (COX) isozyme. It is actively being studied for its similarities and differences between the COX-1 and COX-2 enzymes.