Complex sentence: In the Ancient outpost in Antarctica, Dr. Rodney McKay forces him to sit in the Control Chair, where he accidentally activates a drone weapon zeroing on General O'Neill and Major Sheppard's helicopter, before he manages to stop it.
Split into simpler sentences: In the Ancient outpost in Antarctica, Dr. Rodney McKay forces him to sit in the Control Chair to activate it. However, he also accidentally activates a drone weapon zeroing on General O'Neill and Major Sheppard's helicopter, before he manages to stop it.