( ( ( Staring directly ) ( at ( ( the Sun ) ( -- ( ( even ( through clouds ) ) -- ) ) ) ) ) ( ( can ( lead ( to blindness ) ) ) . ) )
(ROOT (S (S (VP (VBG Staring) (ADVP (RB directly)) (PP (IN at) (NP (NP (DT the) (NNP Sun)) (PRN (: --) (PP (ADVP (RB even)) (IN through) (NP (NNS clouds))) (: --)))))) (VP (MD can) (VP (VB lead) (PP (TO to) (NP (NN blindness))))) (. .)))
Staring directly at the Sun --even through clouds-- can lead to blindness.
(ROOT (S (S (VP (VBG Looking) (ADVP (RB directly)) (PP (IN at) (NP (DT the) (NN sun))))) (VP (MD can) (VP (VB cause) (NP (NN blindness)))) (. .)))