If I understand the interpreting correctly it seems that Mr Sjöstedt himself believes that national constitutions are more important than Community law.
1	If	if	SCONJ	_	_	3	mark	_	_
2	I	I	PRON	PERS-P1SG-NOM	Case=Nom|Number=Sing|Person=1|PronType=Prs	3	nsubj	_	_
3	understand	understand	VERB	PRES	Mood=Ind|Tense=Pres|VerbForm=Fin	8	advcl	_	_
4	the	the	DET	DEF	Definite=Def|PronType=Art	7	det	_	_
5	interpreting	interpreting	NOUN	SG-NOM	Number=Sing	3	obj	_	_
6	correctly	correct	ADV	_	_	3	advmod	_	_
7	it	it	PRON	PERS-SG	_	8	expl	_	_
8	seems	seem	VERB	PRES	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
9	that	that	SCONJ	_	_	13	mark	_	_
10	Mr	mr	NOUN	SG-NOM	Number=Sing	11	nmod	_	_
11	Sjöstedt	Sjöstedt	PROPN	SG-NOM	Number=Sing	13	nsubj	_	_
12	himself	he	PRON	RFL-P3SG	Case=Acc|Gender=Masc|Number=Sing|Person=3|PronType=Prs|Reflex=Yes	11	nmod	_	_
13	believes	believe	VERB	PRES	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	8	ccomp	_	_
14	that	that	SCONJ	_	_	19	mark	_	_
15	national	national	ADJ	POS	Degree=Pos	16	amod	_	_
16	constitutions	constitution	NOUN	PL-NOM	Number=Plur	19	nsubj	_	_
17	are	be	AUX	PRES	Mood=Ind|Tense=Pres|VerbForm=Fin	19	cop	_	_
18	more	very	ADV	CMP	_	19	advmod	_	_
19	important	important	ADJ	POS	Degree=Pos	13	ccomp	_	_
20	than	than	ADP	_	_	22	case	_	_
21	Community	community	NOUN	SG-NOM	Number=Sing	22	compound	_	_
22	law	law	NOUN	SG-NOM	Number=Sing	19	nmod	_	SpaceAfter=No
23	.	.	PUNCT	Period	_	8	punct	_	_
