He became an American citizen in 1954.
1	He	he	PRON	PRP	Case=Nom|Gender=Masc|Number=Sing|Person=3|PronType=Prs	2	nsubj	2:nsubj|5:nsubj:xsubj	Discourse=joint-sequence_m:42->22:1|Entity=(6-person-giv:act-cf1*-1-ana-Yuen_Ren_Chao)
2	became	become	VERB	VBD	Mood=Ind|Number=Sing|Person=3|Tense=Past|VerbForm=Fin	0	root	0:root	_
3	an	a	DET	DT	Definite=Ind|PronType=Art	5	det	5:det	Entity=(6-person-giv:act-cf1*-3-coref-Yuen_Ren_Chao
4	American	American	ADJ	JJ	Degree=Pos	5	amod	5:amod	_
5	citizen	citizen	NOUN	NN	Number=Sing	2	xcomp	2:xcomp	Entity=6)
6	in	in	ADP	IN	_	7	case	7:case	_
7	1954	1954	NUM	CD	NumForm=Digit|NumType=Card	2	obl	2:obl:in	Entity=(87-time-new-cf2-1-sgl)|SpaceAfter=No|XML=<date when:::"1954"></date>
8	.	.	PUNCT	.	_	2	punct	2:punct	_
