I will attach the letter explaining the benefit we are sponsoring.
1	I	I	PRON	PRP	Case=Nom|Number=Sing|Person=1|PronType=Prs	3	nsubj	3:nsubj	_
2	will	will	AUX	MD	VerbForm=Fin	3	aux	3:aux	_
3	attach	attach	VERB	VB	VerbForm=Inf	0	root	0:root	_
4	the	the	DET	DT	Definite=Def|PronType=Art	5	det	5:det	_
5	letter	letter	NOUN	NN	Number=Sing	3	obj	3:obj	_
6	explaining	explain	VERB	VBG	VerbForm=Ger	5	acl	5:acl	_
7	the	the	DET	DT	Definite=Def|PronType=Art	8	det	8:det	_
8	benefit	benefit	NOUN	NN	Number=Sing	6	obj	6:obj	_
9	we	we	PRON	PRP	Case=Nom|Number=Plur|Person=1|PronType=Prs	11	nsubj	11:nsubj	_
10	are	be	AUX	VBP	Mood=Ind|Number=Plur|Person=1|Tense=Pres|VerbForm=Fin	11	aux	11:aux	_
11	sponsoring	sponsor	VERB	VBG	Tense=Pres|VerbForm=Part	8	acl:relcl	8:acl:relcl	SpaceAfter=No
12	.	.	PUNCT	.	_	3	punct	3:punct	_
