Ok, let's see if I can explain this. Bare with me.
The A in "nAgel" is pronounced as a British "A", like in "Say aaah.."
The G is not like in english "dsj" but sharp, like you are clearing your throat. Back of your tongue agains the top of your mouth.
"EL" is the same as in English, like in NigEL.
"Nagel" means "Nail"in Dutch.
The E in kErk is like the American A, like in "CAN"
The last E, kerkE is like the "U" in "Unreal" or "Duh", short.
"Kerk" means "Church" in Dutch
To hear it you can go to http://translate.google.nl/#nl|nl|nagelkerke and klik on the little speaker.