Complex sentence: Because of these potential dangers, accessing the catacombs unescorted by officials has been illegal since November 2,1955; today, there is a €60 fine if one gets caught by the "cataflics"--the special police who patrol the catacombs.
Split into simpler sentences: Because of these dangers, accessing the catacombs without official escort has been illegal since November 2,1955. There is a €60 fine for persons caught by the "cataflics"--the special police who patrol the catacombs.