So, if I may, here is my feedback:

Episode I
CLOAK OF DECEPTION
It is a time of decay in the GALACTIC REPUBLIC. In this turmoil of dissidence and corruption, an ancient menace lurks in the shadows of the galaxy.

Taking advantage of the Galactic Senate’s complacency, the greedy TRADE FEDERATION has seized the peaceful planet of Naboo with a blockade of deadly warships.

With the newly elected Queen of Naboo desperate for help, the Supreme Chancellor has secretly dispatched two Jedi Knights, the guardians of peace and justice in the galaxy, to end the conflict…

I’ve merged your text with bits of Lucas original version and tried to make the transition between the first two paragraphs more natural and trivial.

edit: a fistful of suggestions…
“rises again/awakens/returns” instead of “lurks”
“While Queen Amidala, Ruler of Naboo, seeks for help, the Supreme…”
“to settle the conflict” instead of “to end…”

edit2: well, second version with some of the previous suggestions implemented:

Episode I
CLOAK OF DECEPTION
It is a time of decay in the GALACTIC REPUBLIC. Within this turmoil of dissidence and corruption, an ancient menace rises again in the darkness.

Taking advantage of the Galactic Senate’s complacency, the greedy TRADE FEDERATION has seized the peaceful planet of Naboo with a blockade of deadly warships.

While Queen Amidala of Naboo seeks for help, the Supreme Chancellor has secretly dispatched two Jedi Knights, the guardians of peace and justice in the galaxy, to end the conflict…