This was built 15 years earlier by Jahangir's wife, Nur Jahan, for her father, who served as Mughal Prime Minister.
( This ( ( was ( built ( ( ( 15 years ) earlier ) ( by ( ( ( ( ( ( ( ( Jahangir 's ) wife ) , ) ( Nur Jahan ) ) , ) ( for ( her father ) ) ) , ) ( who ( served ( as ( Mughal ( Prime Minister ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT This)) (VP (VBD was) (VP (VBN built) (PP (ADVP (NP (CD 15) (NNS years)) (RBR earlier)) (IN by) (NP (NP (NP (NNP Jahangir) (POS 's)) (NN wife)) (, ,) (NP (NNP Nur) (NNP Jahan)) (, ,) (PP (IN for) (NP (PRP$ her) (NN father))) (, ,) (SBAR (WHNP (WP who)) (S (VP (VBN served) (PP (IN as) (NP (NNP Mughal) (NNP Prime) (NNP Minister)))))))))) (. .)))
Nur Jahan's father was the Prime Minister of Mughal for 20 years. 
( ( ( Nur ( Jahan 's ) ) father ) ( ( was ( ( the ( Prime Minister ) ) ( of ( Mughal ( for ( 20 years ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNP Nur) (NNP Jahan) (POS 's)) (NN father)) (VP (VBD was) (NP (NP (DT the) (NNP Prime) (NNP Minister)) (PP (IN of) (NP (NP (NNP Mughal)) (PP (IN for) (NP (CD 20) (NNS years))))))) (. .)))