Complex sentence: Caen has a recently built, controversial guided bus system--built by Bombardier Transportation and modelled on its Guided Light Transit technology--and a very efficient network of city buses, operated under the name Twisto.
Split into simpler sentences: Caen has a recently built, controversial guided bus system--built by Bombardier Transportation and modelled on its Guided Light Transit technology. Caen also has a very efficient network of city buses, operated under the name Twisto.