Complex sentence: Muki tells Steven that the word is out that people can mess with Muki and that he must send a message despite their deal, so Muki shoots Steven with Vusi's gun that was confiscated on the way in.
Split into simpler sentences: Muki tells Steven that the word is out that people can mess with Muki, and that he must send a message despite their deal. Muki then shoots Steven with Vusi's gun, which had been confiscated on the way in.