Complex sentence: She looks very similar to Arnold, dressing the same way as he does only her shirt is short-sleeved and has a blue "J" on the side, she wears a blue skirt instead of jeans, hair is slightly longer and wears pink glasses.
Split into simpler sentences: She looks very similar to Arnold, dressing the same way as he does. Only her shirt is short-sleeved and has a blue "J" on the side, she wears a blue skirt instead of jeans and pink glasses.