Complex sentence: This front has a central portico of 16 Corinthian columns flanked on each side by series of square, unfluted columns, between which are reliefs that were added between 1882 and 1901 by Thomas Stirling Lee, C. J. Allen and Conrad Dressler.
Split into simpler sentences: This front has a central portico of 16 Corinthian columns flanked on each side by series of square, unfluted pillars. Between these pillars are reliefs which were added between 1882 and 1901 by Thomas Stirling Lee, C. J. Allen and Conrad Dressler.