Complex sentence: When Andy takes much of the staff to visit "Gettysburg", Robert is elated to see those who stayed behind and calls them the "Free thinkers" and has a staff meeting where they'll present all their best ideas.
Split into simpler sentences: When Andy takes much of the staff to visit Gettysburg, Robert is elated to see those who stayed behind and calls them the "free thinkers". He then has a staff meeting where they will present all their best ideas.