These are artists who are either emerging as leaders in their fields or who have already become well known.
( These ( ( are ( artists ( ( ( who ( ( are either ) ( emerging ( as ( leaders ( in ( their fields ) ) ) ) ) ) ) or ) ( who ( ( have already ) ( become ( well known ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT These)) (VP (VBP are) (NP (NP (NNS artists)) (SBAR (SBAR (WHNP (WP who)) (S (VP (VBP are) (RB either) (VP (VBG emerging) (PP (IN as) (NP (NP (NNS leaders)) (PP (IN in) (NP (PRP$ their) (NNS fields))))))))) (CC or) (SBAR (WHNP (WP who)) (S (VP (VBP have) (ADVP (RB already)) (VP (VBN become) (PP (RB well) (ADJP (VBN known)))))))))) (. .)))
Most people don't know about these artists.
( ( Most people ) ( ( ( do n't ) ( know ( about ( these artists ) ) ) ) . ) )
(ROOT (S (NP (JJS Most) (NNS people)) (VP (VBP do) (RB n't) (VP (VB know) (PP (IN about) (NP (DT these) (NNS artists))))) (. .)))