Complex sentence: BWV 140 is a chorale cantata; its primary melody and text are drawn from a Lutheran chorale, "Wachet auf, ruft uns die Stimme".
Split into simpler sentences: BWV 140 is a chorale cantata, meaning that its primary melody and text are drawn from a Lutheran chorale. In this case, the chorale is "Wachet auf, ruft uns die Stimme".