Complex sentence: After the incident, the Qing refused apologies, confident in the superiority of their navy, which included the Chinese turret ship Dingyuan, a relatively modern pre-dreadnought battleship built in Germany.
Split into simpler sentences: After the incident, the Qing refused apologies, confident in the superiority of their navy. This included the Chinese turret ship Dingyuan, a relatively modern pre-dreadnought battleship built in Germany.