Complex sentence: A viewer called 911, claiming that there was a shooting in the building with hostages, and managed to have a SWAT team to raid the office that Matthewson's gaming company, The Creatures LLC was currently operating out of.
Split into simpler sentences: A viewer called 911 claiming that there was a shooting in the building with hostages. A SWAT team raided the office that Matthewson's gaming company, The Creatures LLC, was operating out of.