Complex sentence: A flyover was constructed over the four lanes of the Hutt Road and the two tracks of the Wairarapa Line south of the Tawa No.1 tunnel, and a bridge constructed between the tunnels to cross State Highway 1 which ascends the Ngauranga Gorge.
Split into simpler sentences: A flyover was constructed over the four lanes of the Hutt Road and the two tracks of the Wairarapa Line south of the Tawa No.1 tunnel. A bridge was constructed between the two tunnels to cross State Highway 1 which ascends the Ngauranga Gorge.