A boy wearing a shirt with the Simpsons character, Ralph Wiggum, plays a Nintendo DS with his sister.
A boy is playing a Nintendo DS with his sister.
Playing with his sister a boy is wearing a shirt.
A boy wearing a shirt with the Simpsons character, Ralph Wiggum is the same as a boy who plays Nintendo DS with his sister.
The boy is playing with his sister because the boy plays with his sister.