Complex sentence: The organization, re-imagined as a government-sanctioned think-tank, was founded by Aldrich Killian (Guy Pearce), is hired to design the Iron Patriot armor and is also the developer of the Extremis virus.
Split into simpler sentences: The organization, re-imagined as a government-sanctioned think-tank, was founded by Aldrich Killian (Guy Pearce). In the film, A.I.M. is hired to design the Iron Patriot armor and is also the developer of the Extremis virus.