Complex sentence: Although rather prominent in the 1970s and 1980's, the Greek Mob has cooled down and remains rather dormant, however, there have been some occurrences of members being found loan sharking in Philadelphia in modern times.
Split into simpler sentences: Although rather prominent in the 1970s and 1980's, the Greek Mob has cooled down and remains rather dormant. However, there have been some occurrences of members being found loan sharking in Philadelphia in modern times.