Complex sentence: After Tower Bridge Gateway crosses under the Union Pacific Railroad line that used to cross the Tower Bridge, a ramp enters the westbound lanes from the intersection of West Capitol Avenue and 5th Street; this completed the former interchange at Riske Lane.
Split into simpler sentences: After Tower Bridge Gateway crosses under the Union Pacific Railroad line that used to cross the Tower Bridge, it approaches an intersection with 5th Street. It was formerly a ramp that entered the westbound lanes from the intersection of West Capitol Avenue and 5th Street, which completed the former interchange at Riske Lane.