Complex sentence: The company built the Liver Building in 1911 and was later involved in projects to build the Queensway Tunnel under the Mersey in 1928, the Dartford Tunnel and the Tyne Tunnel in the 1960s, and Medway Tunnel in the 1990s.
Split into simpler sentences: The company built the Liver Building in 1911, and the Queensway Tunnel under the Mersey in 1928. It was later involved in the projects to build the Dartford Tunnel and the Tyne Tunnel in the 1960s, and Medway Tunnel in the 1990s.