Complex sentence: The southern terminus of Highway 35 is at the Illinois-Wisconsin border three miles (5 km) north of East Dubuque, Illinois, where it continues on as Illinois Route 35, which is, ironically, the shortest state highway in Illinois.
Split into simpler sentences: The southern terminus of Highway 35 is at the Illinois-Wisconsin border, three miles (5 km) north of East Dubuque, Illinois. It continues on into that state as Illinois Route 35, which is, ironically, the shortest state highway in Illinois.