Considering the circulation of The New York Times on Sundays, his column is probably the most widely read commentary on contemporary English in the world; that places more than one uncommon burden on a  he must do his utmost to be accurate; he must try to select subjects likely to be of interest to his readers; and he must write well.
( ( Considering ( ( the circulation ) ( of ( ( The ( New ( York Times ) ) ) ( on Sundays ) ) ) ) ) ( , ( ( ( ( ( ( ( ( ( ( his column ) ( ( is probably ) ( ( ( the ( ( most ( widely read ) ) commentary ) ) ( on ( contemporary English ) ) ) ( in ( the world ) ) ) ) ) ; ) ( that ( places ( ( ( ( more ( than one ) ) ( uncommon burden ) ) ( on ( a he ) ) ) ( must ( do ( his ( utmost ( to ( be accurate ) ) ) ) ) ) ) ) ) ) ; ) ( he ( must ( try ( to ( select ( subjects ( likely ( to ( ( be ( of interest ) ) ( to ( his readers ) ) ) ) ) ) ) ) ) ) ) ) ; ) and ) ( he ( must ( write well ) ) ) ) . ) ) )
(ROOT (S (PP (VBG Considering) (NP (NP (DT the) (NN circulation)) (PP (IN of) (NP (NP (DT The) (NNP New) (NNP York) (NNP Times)) (PP (IN on) (NP (NNP Sundays))))))) (, ,) (S (NP (PRP$ his) (NN column)) (VP (VBZ is) (ADVP (RB probably)) (NP (NP (DT the) (ADJP (RBS most) (RB widely) (JJ read)) (NN commentary)) (PP (IN on) (NP (JJ contemporary) (NNP English))) (PP (IN in) (NP (DT the) (NN world)))))) (: ;) (S (NP (DT that)) (VP (VBZ places) (SBAR (S (NP (NP (QP (JJR more) (IN than) (CD one)) (JJ uncommon) (NN burden)) (PP (IN on) (NP (DT a) (PRP he)))) (VP (MD must) (VP (VB do) (NP (PRP$ his) (NN utmost) (S (VP (TO to) (VP (VB be) (ADJP (JJ accurate)))))))))))) (: ;) (S (NP (PRP he)) (VP (MD must) (VP (VB try) (S (VP (TO to) (VP (VB select) (S (NP (NNS subjects)) (ADJP (JJ likely) (S (VP (TO to) (VP (VB be) (PP (IN of) (NP (NN interest))) (PP (TO to) (NP (PRP$ his) (NNS readers)))))))))))))) (: ;) (CC and) (S (NP (PRP he)) (VP (MD must) (VP (VB write) (ADVP (RB well))))) (. .)))
His column is the most widely read and he always chooses subjects that are interesting to his readers. 
( ( ( ( ( His column ) ( is ( ( the most ) ( widely read ) ) ) ) and ) ( he ( always ( chooses ( subjects ( that ( are ( interesting ( to ( his readers ) ) ) ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (PRP$ His) (NN column)) (VP (VBZ is) (NP (NP (DT the) (JJS most)) (VP (ADVP (RB widely)) (VBN read))))) (CC and) (S (NP (PRP he)) (ADVP (RB always)) (VP (VBZ chooses) (NP (NP (NNS subjects)) (SBAR (WHNP (WDT that)) (S (VP (VBP are) (ADJP (JJ interesting) (PP (TO to) (NP (PRP$ his) (NNS readers)))))))))) (. .)))