Because teaching a man to fish will keep him fed for his entire life.
( ( Because teaching ) ( ( ( a man ) ( to fish ) ) ( ( will ( keep ( him ( fed ( for ( his ( entire life ) ) ) ) ) ) ) . ) ) )
(ROOT (S (PP (IN Because) (NP (NN teaching))) (NP (NP (DT a) (NN man)) (PP (TO to) (NP (NN fish)))) (VP (MD will) (VP (VB keep) (S (NP (PRP him)) (VP (VBN fed) (PP (IN for) (NP (PRP$ his) (JJ entire) (NN life))))))) (. .)))
A man who knows how to fish can feed himself for his entire life. 
( ( ( A man ) ( who ( ( knows how ) ( to fish ) ) ) ) ( ( can ( ( feed himself ) ( for ( his ( entire life ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT A) (NN man)) (SBAR (WHNP (WP who)) (S (VP (VBZ knows) (NP (WRB how)) (PP (TO to) (NP (NN fish))))))) (VP (MD can) (VP (VB feed) (NP (PRP himself)) (PP (IN for) (NP (PRP$ his) (JJ entire) (NN life))))) (. .)))