Complex sentence: In 1808, Heinrich von Kleist's published but unperformed play "Die Hermannsschlacht", unperformable after Napoleon's victory at Wagram, aroused anti-Napoleonic German sentiment and pride among its readers.
Split into simpler sentences: In 1808, Heinrich von Kleist's published, but never performed the play "Die Hermannsschlacht". It became unperformable after Napoleon's victory at Wagram, aroused anti-Napoleonic German sentiment and pride among its readers.