Generate a correctly punctuated version of the following text: The area was populated as early as antique times On a plateau called Gradina traces of a habitation and a late antique Byzantine fortification perhaps Biston have been found On the southern side of the plateau part of the fortification walls has been preserved while several stelae from the 2nd to the 4th centuries have been found now kept at the Archaeological Museum in Split
The area was populated as early as antique times. On a plateau called Gradina, traces of a habitation and a late antique Byzantine fortification, perhaps Biston, have been found. On the southern side of the plateau, part of the fortification walls has been preserved, while several stelae from the 2nd to the 4th centuries have been found (now kept at the Archaeological Museum in Split).