( ( ( ( ( ( Looking directly ) ( at ( the sun ) ) ) ( or ( even ( near ( to ( ( the sun ) ( can ( ( cause damage ) ( to ( part ( of ( your eye ) ) ) ) ) ) ) ) ) ) ) ) called ) ( ( ( the retina ) , ) ( which ( can ( lead ( to blindness ) ) ) ) ) ) . )
(ROOT (SINV (VP (VBG Looking) (ADVP (RB directly)) (PP (IN at) (NP (DT the) (NN sun)))) (PRN (CC or) (ADJP (RB even) (JJ near) (PP (TO to) (NP (NP (DT the) (NN sun)) (SBAR (S (VP (MD can) (VP (VB cause) (NP (NN damage)) (PP (TO to) (NP (NP (NN part)) (PP (IN of) (NP (PRP$ your) (NN eye))))))))))))) (VP (VBD called)) (NP (NP (DT the) (NN retina)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (MD can) (VP (VB lead) (PP (TO to) (NP (NN blindness)))))))) (. .)))
Looking directly at the sun or even near to the sun can cause damage to part of your eye called the retina, which 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)))) (. .)))