Complex sentence: Joseph Marie Albert "Joep" Lange (1954--17 July 2014) was a Dutch clinical researcher from the Netherlands, specializing in HIV therapy who served as the President of the International AIDS Society from 2002 to 2004.
Split into simpler sentences: Joseph Marie Albert "Joep" Lange (1954--17 July 2014) was a Dutch clinical researcher specialized in HIV therapy. He served as the President of the International AIDS Society from 2002 to 2004.