That is nonsense, of course; but even if the users remain keenly aware that 1669 is the date only of the earliest written evidence, of what use or importance is that to them?
( ( That ( is ( ( nonsense , ) ( of course ) ) ) ) ( ; ( ( but ( even ( if ( ( the users ) ( remain ( keenly ( aware ( that ( 1669 ( is ( ( ( ( ( the date ) ( only of ) ) ( the ( earliest ( written evidence ) ) ) ) , ) ( of ( what ( ( ( use or ) importance ) ( is ( that ( to them ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ? ) ) )
(ROOT (FRAG (S (NP (DT That)) (VP (VBZ is) (NP (NP (NN nonsense)) (, ,) (PP (IN of) (NP (NN course)))))) (: ;) (FRAG (CC but) (RB even) (SBAR (IN if) (S (NP (DT the) (NNS users)) (VP (VBP remain) (ADJP (RB keenly) (JJ aware) (SBAR (IN that) (S (NP (CD 1669)) (VP (VBZ is) (NP (NP (DT the) (NN date)) (CONJP (RB only) (IN of)) (NP (DT the) (JJS earliest) (VBN written) (NN evidence)) (, ,) (PP (IN of) (SBAR (WHNP (WP what)) (S (NP (NN use) (CC or) (NN importance)) (VP (VBZ is) (NP (NP (DT that)) (PP (TO to) (NP (PRP them))))))))))))))))) (. ?)))
For what purpose should the users remember that 1559 is the date of the earliest written proof?
( ( For ( what purpose ) ) ( ( ( should ( the users ) ) ( remember ( that ( 1559 ( is ( ( the date ) ( of ( the ( earliest ( written proof ) ) ) ) ) ) ) ) ) ) ? ) )
(ROOT (SBARQ (WHPP (IN For) (WHNP (WDT what) (NN purpose))) (SQ (MD should) (NP (DT the) (NNS users)) (VP (VB remember) (SBAR (IN that) (S (NP (CD 1559)) (VP (VBZ is) (NP (NP (DT the) (NN date)) (PP (IN of) (NP (DT the) (JJS earliest) (JJ written) (NN proof))))))))) (. ?)))