Complex sentence: There are two stretches in Sweden and Denmark where three European routes run concurrently; these are E6, E20 and E22 in Sweden, and E20, E47 and E55 in Denmark.
Split into simpler sentences: There are two stretches in Sweden and Denmark where three European routes go concurrent. These are E6, E20 and E22 in Sweden, and E20, E47 and E55 in Denmark.