Complex sentence: The name, rocker, refers to a urban tribe of fans of rock music in the United Kingdon, the bikers, fans of rock music, were the first to be known by name, but later spread to several countries without association with motorcycles.
Split into simpler sentences: The name, rocker, refers to a urban tribe of fans of rock music. In the United Kingdon, the bikers, fans of rock music, were the first to be known by name, but later spread to several countries without association with motorcycles.