Complex sentence: His mother was so worried by his social development that she considered entering him in a study for autistic children led by Bruno Bettelheim, but decided against putting him through the study after being put off by the doctor's abrupt and cold manner in the classroom.
Split into simpler sentences: His mother was so worried by his poor social development that she considered entering him in a study for autistic children led by Bruno Bettelheim. She decided not to put him through the study after being put off by the doctor's abrupt and cold manner in the classroom.