Complex sentence: Traffic jams are commonplace during rush hour and at the beginning and end of major holidays in Germany; there are few "green waves" or roundabouts, and the city's prosperity often causes an abundance of obstructive construction sites.
Split into simpler sentences: Traffic jams are commonplace during rush hour as well as at the beginning and end of major holidays in Germany. There are few "green waves" or roundabouts, and the city's prosperity often causes an abundance of obstructive construction sites.