Complex sentence: This is achieved by increasing expression of the glycoprotein complex GPIIb/IIIa on the cell membrane of platelets, an effect also achieved by ADP in platelet stimulation, which is blocked by clopidogrel.
Split into simpler sentences: This is achieved by increasing expression of the glycoprotein complex GPIIb/IIIa on the cell membrane of platelets. The same effect also achieved by ADP in platelet stimulation, which is blocked by clopidogrel.