Complex sentence: During state receptions and functions the Jordan Staircase was a focal point for arriving guests who after entering the palace through the Ambassadors' entrance, in the central courtyard, would pass through the collonaded ground floor Jordan Hall before ascending the staircase to the state apartments.
Split into simpler sentences: During state receptions and functions the Jordan Staircase was a focal point for arriving guests. After entering the palace through the Ambassadors' entrance, in the central courtyard, they would pass through the collonaded ground floor Jordan Hall before ascending the staircase to the state apartments.