The following translation is from an official Common translation of the famous Lord of the Rings books by J. R. R. Tolkien.

Original:

Three Rings for the Elven-kings under the sky,
Seven for the Dwarf-lords in their halls of stone,
Nine for Mortal Men doomed to die,
One for the Dark Lord on his dark throne
In the Land of Mordor where the Shadows lie.
One Ring to rule them all, One Ring to find them,
One Ring to bring them all and in the darkness bind them
In the Land of Mordor where the Shadows lie.

Common (na Xafen):

Nar Net Tuaz upána nar Elfy paratca epáli na zoa,
Nar Kinni yn upána nar Tuarfy jen fit naz mot towa,
Nar Xiro yn upána nar letkas Atuin su si riske let,
Na Ate yn upána na Synti Jen su elua na synti zron se jal
E na Wekja na Mordor e sun az Stif se jal.
Ja Ate Tuaz hap parat ar awke spe'n, ja Ate Tuaz te hefol,
Ja Ate Tuaz hap falu ar awke spe'n, hanja fit na synti te sef
E na Wekja na Mordor e sun az Stif se jal.

IPA:

/nar 'net 'tu.aθ u'ba.na nar 'el.və 'pa.rad͡ʒːa e'ba.li na 'θo.a
nar 'kin.ni ən u'ba.na nar 'tu.ar.və 'jen fit naθ 'mot 'to.wa
nar 'ʃi.ro ən u'ba.na nar led.gas 'a.du.in su si 'ris.ke let
na 'a.de ən u'ba.na na 'sən.di 'jen su 'e.lu.a na 'sən.di 'θron se 'jal
e na 'weg.ja na 'mor.dor e 'sun aθ 'stif se 'jal
ja 'a.de 'tu.aθ hap 'pa.rat ar 'aw.ge 'spen, ja 'a.de 'tu.aθ te 'he.vol
ja 'a.de 'tu.aθ hap 'fa.lu ar 'aw.ge 'spen, 'han.ja fit na 'sən.di te 'sef
e na 'weg.ja na 'mor.dor e 'sun aθ 'stif se 'jal/

Gloss:

The(NOM.PA) three ring for-benefit the(NOM.PA) Elf director under the(NOM) sky,
The(NOM.PA) seven thing for-benefit the(NOM.PA) Dwarf head inside the(NOM.PL) stone cave,
The(NOM.PA) nine thing for-benefit the(NOM.PA) die-EXP-MOD person RELN.ABS stand(NP.IM.IR) must die,
The(NOM.S) one thing for-benefit the(NPM.S) Black Head RELN.ABS on-top the(NOM) black throne stand(NP.IM) rest
At the(NOM) country the(NOM) Mordor at RELN.NOM the(ABS.PL) shadow stand(NP.IM) rest.
The(ERG.S) one ring give(NP.IM) direct the(ABS.PA) all this, the(ERG) one ring hit(NP.IM) find,
The(ERG.S) one ring give(NP.IM) arrive the(ABS.PA) all this, and-then inside the(NOM) dark hit(NP.IM) detain
At the(NOM) country the(NOM) Mordor at RELN.NOM the(ABS.PL) shadow stand(NP.IM) rest.

Notes:

Elf (elfy), drawf (tuarfy) and throne (zron) are just straight loans from English. Some other words were given Common equivalents, so 'paratca', 'director', for king, and 'jen', 'head', for lord. Mordor was just carried over straight without Commonising to 'Mortor'. The central verse is rendered as a regular Common declarative sentence.