Complex sentence: There is surface evidence of an Ancient Roman settlement in the hamlet of Groblje in Dekmanca, but, although the site has been protected as a national heritage site by the Slovenian Ministry of Culture, it has not been investigated in any detail so far.
Split into simpler sentences: There is surface evidence of an Ancient Roman settlement in the Groblje area in Dekmanca. The site has been protected as a national heritage site by the Slovenian Ministry of Culture, but it has not been investigated in any detail so far.