Complex sentence: On the fault's south side, Carboniferous material is visible; this debris is not evident on the north side, which suggests that the fault was acting as a "dividing fault" while the area around it underwent sedimentation.
Split into simpler sentences: On the fault's south side, Carboniferous material is visible; this debris is not evident on the north side. This is perhaps evident of an aged fault that was present as early as the Carboniferous period, acting as a "dividing fault" while the area around it underwent sedimentation.