Complex sentence: The style had its origins in the 17th century Portuguese influence upon the region, and was at the time associated with the urban poor and as such had somewhat of an unsavoury reputation, particularly among traditionalists.
Split into simpler sentences: The style had its origins in the 17th century Portuguese influence upon the regio. It was associated with the urban poor and, as such, had somewhat of an unsavoury reputation, particularly among traditionalists.