Complex sentence: While being taken via a shuttle to Boraal to serve as hostages, their shuttle is captured by an Imperial Star Destroyer: the Galactic Empire had arrived in the Taroon system to impose order and put an end to the longstanding civil war.
Split into simpler sentences: While being taken via a shuttle to Boraal to serve as hostages, their shuttle was captured by an Imperial Star Destroyer. The Galactic Empire had arrived in the Taroon system to impose order and put an end to the longstanding civil war.