Complex sentence: Haydn composed this mass at Eisenstadt in August 1796, at the time of Austria's general mobilisation, four years into the European war that followed the French Revolution, Austrian troops were doing badly against the French in Italy and Germany, and Austria feared invasion.
Split into simpler sentences: Haydn composed this mass at Eisenstadt in August 1796, at the time of Austria's general mobilisation into war. Four years into the European war that followed the French Revolution, Austrian troops were doing badly against the French in Italy and Germany, and Austria feared invasion.