Complex sentence: Indebted to the Jedi, Jar Jar leads them to the underwater Gungan city where the Jedi try but fail to persuade the Gungans to help the people of Naboo, though they are able to obtain transportation to the capital city of Theed on the surface.
Split into simpler sentences: Indebted to the Jedi, Jar Jar leads them to the underwater Gungan city. There, the Jedi unsuccessfully attempt to persuade the Gungans to help the people of Naboo, though they are able to obtain a transport to reach the Capital city of Theed on the surface.