He was attracted by a strange whistling and after searching about in the undergrowth, he discovered that it was caused by wind escaping through a small hole in some rocks.
(He; was attracted; by a strange whistling) (He; after searching; about; L:in the undergrowth) (wind; escaping; through a small hole in some rocks) (he; discovered; that it was caused by wind; T:after searching about in the undergrowth) Context(he discovered,List([86, 99))):(it; was caused; by wind)
he discovered,List([86, 99))
He He wind he it
was attracted after searching escaping discovered was caused
by a strange whistling
about L:in the undergrowth
through a small hole in some rocks
that it was caused by wind T:after searching about in the undergrowth
by wind