Complex sentence: After the crew members tell David of their mission, they attempt to radio the "Covenant" for help, but the surviving neomorph infiltrates the city and finds security-team member Rosenthal alone before decapitating her.
Split into simpler sentences: After the crew members tell David of their mission, they attempt to radio the Covenant for help. The surviving neomorph infiltrates the city and finds security-team member Rosenthal alone before decapitating her.