My suggestion is something like:

There is a Great Disturbance in the Force! For centuries, the peaceful people of Naboo and the neighboring warrior race of the GUNGANS have lived in a shaky state of peace. However now tension threatens to engulf the planet in CIVIL WAR, causing QUEEN AMIDALA to plead to the Senate for some sort of solution to this conflict.

Hindered by war profiteers and those that see instability as an opportunity alike, Supreme Chancellor Valorum has secretly dispatched two Jedi Knights, chivalrous warriors and ancient scholars of the Force, to aid the young Queen of Naboo in his stead.

Unknown to all, a dark force lingers within the shadows, waiting for the opportunity to strike, as Jedi Master QUI-GON JINN and his young apprentice OBI-WAN KENOBI make their way to the Gungan underwater city to settle the conflict between the two races…

(Note: Could probably use some condensing, but sorta trying to get the general ideas across. Keeping your proposed middle paragraph.)