The arches that flank the nave are filled with tiers of columns and the walls with windows, while the arches above the entrance and the apse are backed by semi-domes, further increasing the interior space.
( ( ( The arches ) ( that ( flank ( the nave ) ) ) ) ( ( are ( ( ( ( filled ( with ( tiers ( of ( ( columns and ) ( the walls ) ) ) ) ) ) ( with windows ) ) , ) ( while ( ( ( the arches ) ( above ( ( ( the entrance ) and ) ( the apse ) ) ) ) ( are ( ( ( backed ( by semi-domes ) ) , ) ( further ( increasing ( the ( interior space ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NNS arches)) (SBAR (WHNP (WDT that)) (S (VP (VBP flank) (NP (DT the) (NN nave)))))) (VP (VBP are) (VP (VBN filled) (PP (IN with) (NP (NP (NNS tiers)) (PP (IN of) (NP (NP (NNS columns)) (CC and) (NP (DT the) (NNS walls)))))) (PP (IN with) (NP (NNS windows))) (, ,) (SBAR (IN while) (S (NP (NP (DT the) (NNS arches)) (PP (IN above) (NP (NP (DT the) (NN entrance)) (CC and) (NP (DT the) (NN apse))))) (VP (VBP are) (VP (VBN backed) (PP (IN by) (NP (NNS semi-domes))) (, ,) (S (ADVP (RB further)) (VP (VBG increasing) (NP (DT the) (JJ interior) (NN space)))))))))) (. .)))
The arches that flank the nave are different from the arches above the entrance.
( ( ( The arches ) ( that ( flank ( the nave ) ) ) ) ( ( are ( different ( from ( ( the arches ) ( above ( the entrance ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NNS arches)) (SBAR (WHNP (WDT that)) (S (VP (VBP flank) (NP (DT the) (NN nave)))))) (VP (VBP are) (ADJP (JJ different) (PP (IN from) (NP (NP (DT the) (NNS arches)) (PP (IN above) (NP (DT the) (NN entrance))))))) (. .)))