Complex sentence: Performed to celebrate the third birthday of Frederick's daughter Augusta, it remains among the best-known British patriotic songs up to the present, while the masque of which it was originally part is only remembered by specialist historians.
Split into simpler sentences: Performed to celebrate the third birthday of Frederick's daughter Augusta. It remains among the best-known British patriotic songs up to the present, while the masque of which it was originally part is only remembered by specialist historians.