Complex sentence: A by antechamber is attached to the north side of space, and the entry way between the great kiva and the antechamber contained a stairway that rose in nine steps from the kiva floor.
Split into simpler sentences: A by antechamber is attached to the north side of the great kiva. The entry way between the great kiva and the antechamber contained a stairway that rose in nine steps from the kiva floor.