Woman in a blue dress and carrying a black purse, rides a scooter down the street.
the women rides a scooter down the street
The woman rides a scooter down the street is part of her description in blue dress.
"the women rides a scooter down the street" is rephrasing "Woman in a blue dress and carrying a black purse, rides a scooter down the street."
Woman in a blue dress is a type of woman.