Complex sentence: Amphorae served primarily as vessels for storage evolving from pithos jars, and later, during the Late Geometric Period, they were used as marker vases for graves: their depictions and size giving indications of the social status of the deceased.
Split into simpler sentences: Amphorae served primarily as vessels for storage evolving from pithos jars. During the Late Geometric Period amphorae were used as marker vases for graves: their depictions and size giving indications of the social status of the deceased.