Complex sentence: The Turkish Navy, however, continued to be a major sea power until the early decades of the 19th century, and for a brief period in the late 19th century, during the reign of Sultan Abdülaziz, had the third largest naval fleet in the world.
Split into simpler sentences: The Turkish Navy, however, continued to be a major sea power until the early decades of the 19th century. For a brief period in the late 19th century, during the reign of Sultan Abdülaziz, it was the third largest naval fleet in the world.