He then searched the boat unsuccessfully for another pencil or a pen, then tried to find a knife to sharpen a new pencil point.
(He; searched unsuccessfully; for another pencil or a pen; T:then) Context(He searched unsuccessfully,List([0, 40))):(He; searched unsuccessfully for another pencil or a pen tried; to find a knife; T:then)
He searched unsuccessfully,List([0, 40))
He He
searched unsuccessfully searched unsuccessfully for another pencil or a pen tried
for another pencil or a pen T:then
to find a knife T:then