Complex sentence: Weyland finds out about this during the procedure and cuts the power to prevent Katya from trying to remove the Alien from Tequila and is forced to put her into a stasis capsule to prevent the Alien from hatching and killing her.
Split into simpler sentences: Weyland finds out about this during the procedure and cuts the power to prevent Katya from trying to remove the alien from Tequila. Rookie is forced to put her into a stasis capsule to prevent the alien from "bursting" and killing her.