Someone in a white and black polka dot outfit handing out small cartons of orange juice behind caution tape on a street.
A person in a polka dot outfit is handing out orange juice behind a caution area.
Someone is a person.
Someone is a person, and white and black polka dot outfit is a type of polka dot outfit.
The person is in polka dots, and is behind a caution area that is on a street.