Complex sentence: After Tipu's eventual defeat in the Fourth Anglo-Mysore War and the capture of the Mysore iron rockets, they were influential in British rocket development, inspiring the Congreve rocket, which was soon put into use in the Napoleonic Wars.
Split into simpler sentences: After Tipu's eventual defeat in the Fourth Anglo-Mysore War, the Mysore iron rockets were captured by the British. These rockets were influential in British rocket development, inspiring the Congreve rocket, which were soon put into use in the Napoleonic Wars.