I rewrote your opening crawl to cut down the word count:

Following the conclusion of the Clone Wars, occupation of the planet MANDALORE transferred to the reorganized GALACTIC EMPIRE. As a result, civil war has broken out on the planet, making travel throughout the Outer Rim difficult.

Looking to secure a new hyperspace route, PHOENIX SQUADRON, a small Rebel cell led by Hera Syndulla, seeks safe passage to their fleet.

With SABINE WREN, a fellow Rebel turned Mandalorian, on their side, the squad sets Concord Dawn as their destination. . . .

I haven’t watched this arc of Rebels yet so let me know if there are any inaccuracies!