Complex sentence: However, Vorontsov's plans are ruined by the War Minister, Chernyshov, a rival prince who is jealous of him, and Murat has to remain in the fortress because the Tsar is told he is possibly a spy.
Split into simpler sentences: However, Vorontsov's plans are ruined by the War Minister, Chernyshov. A rival prince who is jealous of him, and Murat has to remain in the fortress because the Tsar is told he is possibly a spy.