Complex sentence: She is debriefed by her employers at the Weyland-Yutani Corporation over the destruction of her ship, the "Nostromo"; they are skeptical of her claims that an Alien killed the ship's crew and forced her to destroy the ship.
Split into simpler sentences: She is debriefed by her employers at the Weyland-Yutani Corporation over the destruction of her ship, the "Nostromo". They are skeptical of her claims that an Alien killed the ship's crew and forced her to destroy the ship.