Complex sentence: Notices in the chronicles of this localised line of Atabegs are only sporadic, and numismatic evidences have not thus far been found, so there is a difficultly in reconstructing their chronology and genealogy.
Split into simpler sentences: Notices in the chronicles of this localised line of Atabegs are only sporadic, and numismatic evidences have not thus far been found. So there is a difficultly in reconstructing their chronology and genealogy.