Complex sentence: Then east of Gary to Michigan City US 20 is a two-lane highway, from Michigan City to west of South Bend US 20 is a four-lane undivided highway and two-lane rural highway.
Split into simpler sentences: Then east of Gary to Michigan City US 20 is a two-lane highway. From Michigan City to west of South Bend US 20 is a four-lane undivided highway and two-lane rural highway.