( ( ( ( ( Algae ( ( ( are protists ) , ) too ) ) , ) but ) ( they ( ( are often ) ( thought ( of ( as plants ) ) ) ) ) ) . )
(ROOT (S (S (NP (NNP Algae)) (VP (VBP are) (ADJP (JJ protists)) (, ,) (ADVP (RB too)))) (, ,) (CC but) (S (NP (PRP they)) (VP (VBP are) (ADVP (RB often)) (VP (VBN thought) (PP (IN of) (PP (IN as) (NP (NNS plants))))))) (. .)))
Algae are protists, too, but they are often thought of as plants.
(ROOT (S (NP (JJ Multiple) (NN fission)) (VP (VBZ is) (ADVP (RBR more) (RB often)) (VP (VBN observed) (PP (IN among) (NP (NNS protists))))) (. .)))