It is a time of despair.
Luke Skywalker, striving
to restore the legendary
Jedi Knights, has vanished.

In his absence, legions
of brutal warriors under
the command of the
IMPERIAL FIRST ORDER
have emerged from a
mysterious hidden base
to terrorize star systems
throughout the peaceful
New Republic.

Overwhelmed by chaos,
several members of the
bitterly divided Senate
have secretly called upon
a daring RESISTANCE
to find the last Jedi and
restore peace and justice
to the darkening stars…

I like that one a lot.

The only thing I would recommend is saying “Jedi Order” instead of “Jedi Knights”. For one thing it fixes the thing you mentioned about amount of characters per line, but also I think it’s implied enough that the Jedi Order are peacekeepers by saying Luke’s absence causes chaos and his return causes peace and justice.