Chao taught mathematics at Tsinghua University and, one year later, returned to the United States to teach at Harvard.
1	Chao	Chao	PROPN	NNP	Number=Sing	2	nsubj	2:nsubj|13:nsubj	Discourse=joint-sequence_m:28->22:1|Entity=(6-person-giv:inact-cf1-1-coref-Yuen_Ren_Chao)
2	taught	teach	VERB	VBD	Mood=Ind|Number=Sing|Person=3|Tense=Past|VerbForm=Fin	0	root	0:root	_
3	mathematics	mathematics	NOUN	NN	Number=Sing	2	obj	2:obj	Entity=(12-abstract-giv:inact-cf2-1-coref)
4	at	at	ADP	IN	_	6	case	6:case	_
5	Tsinghua	Tsinghua	PROPN	NNP	Number=Sing	6	compound	6:compound	Entity=(60-organization-new-cf5-1,2-coref-Tsinghua_University|XML=<ref target:::"https://en.wikipedia.org/wiki/Tsinghua_University">
6	University	University	PROPN	NNP	Number=Sing	2	obl	2:obl:at	Entity=60)|XML=</ref>
7	and	and	CCONJ	CC	_	13	cc	13:cc	SpaceAfter=No
8	,	,	PUNCT	,	_	7	punct	7:punct	_
9	one	one	NUM	CD	NumForm=Word|NumType=Card	10	nummod	10:nummod	Discourse=joint-sequence_m:29->22:1|Entity=(61-time-new-cf6-2-sgl|XML=<date when:::"1921">
10	year	year	NOUN	NN	Number=Sing	13	obl:tmod	13:obl:tmod	_
11	later	late	ADV	RBR	Degree=Cmp	10	advmod	10:advmod	Entity=61)|SpaceAfter=No|XML=</date>
12	,	,	PUNCT	,	_	10	punct	10:punct	_
13	returned	return	VERB	VBD	Mood=Ind|Number=Sing|Person=3|Tense=Past|VerbForm=Fin	2	conj	2:conj:and	_
14	to	to	ADP	IN	_	17	case	17:case	_
15	the	the	DET	DT	Definite=Def|PronType=Art	17	det	17:det	Entity=(7-place-giv:inact-cf3-2,3-coref-United_States
16	United	Unite	VERB	NNP	Tense=Past|VerbForm=Part	17	amod	17:amod	_
17	States	State	PROPN	NNPS	Number=Plur	13	obl	13:obl:to	Entity=7)
18	to	to	PART	TO	_	19	mark	19:mark	Discourse=purpose-goal:30->29:0
19	teach	teach	VERB	VB	VerbForm=Inf	13	advcl	13:advcl:to	_
20	at	at	ADP	IN	_	21	case	21:case	_
21	Harvard	Harvard	PROPN	NNP	Number=Sing	19	obl	19:obl:at	Entity=(20-organization-giv:inact-cf4-1-coref-Harvard_University)|SpaceAfter=No
22	.	.	PUNCT	.	_	2	punct	2:punct	_
