Complex sentence: To the surprise of the doctors working with her she appeared very interested in exploring environmental stimuli, although objects seemed to intrigue her much more than people, especially noting the extreme intensity with which she looked for new sources of stimulation.
Split into simpler sentences: To the surprise of the doctors working with her she appeared very interested in exploring environmental stimuli, although objects seemed to intrigue her much more than people. They especially noted the extreme intensity with which she looked for new sources of stimulation.