Complex sentence: This video is then shown to the child over a series of several weeks, and every time the child sees himself or herself verbally answering the teacher/other adult, the tape is stopped and the child is given positive reinforcement.
Split into simpler sentences: This video is then shown to the child over a series of several weeks. The child is asked to view the tape and every time they see themselves answering the teacher verbally, the tape is stopped and the child is given a positive reinforcement.