Complex sentence: F. Porsche AG (which stands for "Doktor Ingenieur honoris causa Ferdinand Porsche Aktiengesellschaft") currently produces Porsche 911, Boxster and Cayman sports cars, the Cayenne sport utility vehicle and the four-door Panamera.
Split into simpler sentences: F. Porsche AG (which stands for "Doktor Ingenieur honoris causa Ferdinand Porsche Aktiengesellschaft"), is responsible for the actual production and manufacture of the Porsche automobile line. The company currently produces Porsche 911, Boxster and Cayman sports cars, the Cayenne sport utility vehicle and the four-door Panamera.