The magnet causes the individual particles of the iron, which act like tiny magnets, to line up so that the sample 
(the iron; act; like tiny magnets) (The magnet; causes; the individual particles of the iron, which act like tiny magnets, to line up) Context(The magnet causes,List([0, 17))):(the individual particles of the iron; to line up; )
The magnet causes,List([0, 17))
the iron The magnet the individual particles of the iron
act causes to line up
like tiny magnets
the individual particles of the iron, which act like tiny magnets, to line up