Complex sentence: Andy's teacher Miss Kettlewell (Beth Grant) discovers an obscenity the doll wrote on his worksheet; believing Andy himself was the culprit, she forces Andy to stay in the classroom as punishment, and locks Chucky in the closet.
Split into simpler sentences: Andy's teacher Miss Kettlewell (Beth Grant) discovers an obscenity Chucky wrote on his worksheet. Believing Andy was responsible, she forces Andy to stay in the classroom as punishment, and locks Chucky in the closet.