Complex sentence: Shepard teams up with Jacob Taylor and medical officer Wilson to reach the escape shuttle, but Miranda Lawson, who was already waiting at the shuttle bay, shoots Wilson, citing him as the station's betrayer.
Split into simpler sentences: Shepard teams up with Jacob Taylor and medical officer Wilson to reach the escape shuttle. However, Miranda Lawson, who was already waiting at the shuttle bay, shoots Wilson, citing him as the station's betrayer.