Complex sentence: The tunnel roof structure is designed to carry all 16 pre-existing railway tracks while the ground structure provides one lane north bound and two lanes south bound vehicular connections as well as one bicycle lane and one extra wide pedestrian sidewalk on each side of the tunnel.
Split into simpler sentences: The tunnel roof structure is designed to carry all 16 pre-existing railway tracks. The ground structure provides one vehicle lane north bound and two lanes south bound, one bicycle lane and one extra wide pedestrian sidewalk on each side of the tunnel.