It's thought he used the same architect who worked on the Taj Mahal.
( It ( ( 's ( thought ( he ( used ( ( the ( same architect ) ) ( who ( worked ( on ( the ( Taj Mahal ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP It)) (VP (VBZ 's) (VP (VBN thought) (SBAR (S (NP (PRP he)) (VP (VBD used) (NP (NP (DT the) (JJ same) (NN architect)) (SBAR (WHNP (WP who)) (S (VP (VBD worked) (PP (IN on) (NP (DT the) (NNP Taj) (NNP Mahal)))))))))))) (. .)))
The architect who worked on the Taj Mahal is thought to have worked on another building.
( ( ( The architect ) ( who ( worked ( on ( the ( Taj Mahal ) ) ) ) ) ) ( ( is ( thought ( to ( have ( worked ( on ( another building ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN architect)) (SBAR (WHNP (WP who)) (S (VP (VBD worked) (PP (IN on) (NP (DT the) (NNP Taj) (NNP Mahal))))))) (VP (VBZ is) (VP (VBN thought) (S (VP (TO to) (VP (VB have) (VP (VBN worked) (PP (IN on) (NP (DT another) (NN building))))))))) (. .)))