It's the same magnetic field that causes compass needles to point north.
(It; 's; the same magnetic field that causes compass needles to point north) (the same magnetic field; causes; compass needles to point north) Context(the same magnetic field causes,List([5, 40))):(compass needles; to point; north)
the same magnetic field causes,List([5, 40))
It the same magnetic field compass needles
's causes to point
the same magnetic field that causes compass needles to point north
compass needles to point north
north