How can a broken end of oil stick be removed from deep in the resevior? on 2002 Nissan Sentra

when I bought this car, the former owner explained the lack of an oil dipstick, by saying he broke it off in the resevior, but removed it using a magnet and stick (that was hard to believe!) and was told all I needed to do was buy a new one.
I can only get a dipstick in between 1/2 and 3/4 of the way.

Asked by for the 2002 Nissan Sentra
the tube may be kinked. remove the tube and check it out. it is held by 1 10mm bolt.