Complex sentence: In 2001, Ducati introduced the 996R (see Ducati 996), which was the true introduction of the Testastretta engine and the 998 model.
Split into simpler sentences: In 2001, Ducati introduced the 996R (see Ducati 996) with the 998 cc Testastretta engine. This bike was the true introduction of the Testastretta engine and the 998 model.